diff --git a/NEWS.md b/NEWS.md
index 6d581c2a..f906468c 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -13,6 +13,9 @@ Red Panda C++ Version 0.14.5
   - enhancement: better processing of symbol completion
   - enhancement: better support of ligatures
   - enhancement: use the expression evaluation logic to handle "goto declaration"/"goto definition" 
+  - enhancement: reduce startup time by about 1 second.
+  - enhancement: add option "mouse selection/drag scroll speed" in the options dialog's "Editor" / "general" tab.
+  - fix: scroll speed of mouse selection/drag is too fast
 
 Red Panda C++ Version 0.14.4
   - enhancement: git - log
diff --git a/RedPandaIDE/RedPandaIDE_zh_CN.ts b/RedPandaIDE/RedPandaIDE_zh_CN.ts
index 8d623312..d7cf17cd 100644
--- a/RedPandaIDE/RedPandaIDE_zh_CN.ts
+++ b/RedPandaIDE/RedPandaIDE_zh_CN.ts
@@ -1309,45 +1309,43 @@ Are you really want to continue?</oldsource>
         <translation>要剪切的内容超过了字符数限制！</translation>
     </message>
     <message>
-        <location filename="editor.cpp" line="2550"/>
+        <location filename="editor.cpp" line="2582"/>
         <source>Print Document</source>
         <translation>打印文档</translation>
     </message>
     <message>
-        <location filename="editor.cpp" line="3147"/>
-        <location filename="editor.cpp" line="3186"/>
-        <location filename="editor.cpp" line="3240"/>
+        <location filename="editor.cpp" line="3179"/>
+        <location filename="editor.cpp" line="3218"/>
+        <location filename="editor.cpp" line="3272"/>
         <source>Ctrl+click for more info</source>
         <translation>Ctrl+单击以获取更多信息</translation>
     </message>
     <message>
-        <location filename="editor.cpp" line="3638"/>
-        <location filename="editor.cpp" line="3668"/>
         <source>Symbol &apos;%1&apos; not found!</source>
-        <translation>未找到符号&apos;%1&apos;!</translation>
+        <translation type="vanished">未找到符号&apos;%1&apos;!</translation>
     </message>
     <message>
-        <location filename="editor.cpp" line="3961"/>
+        <location filename="editor.cpp" line="4000"/>
         <source>astyle not found</source>
         <translation>找不到astyle程序</translation>
     </message>
     <message>
-        <location filename="editor.cpp" line="3962"/>
+        <location filename="editor.cpp" line="4001"/>
         <source>Can&apos;t find astyle in &quot;%1&quot;.</source>
         <translation>找不到astyle程序&quot;%1&quot;.</translation>
     </message>
     <message>
-        <location filename="editor.cpp" line="4111"/>
+        <location filename="editor.cpp" line="4151"/>
         <source>Break point condition</source>
         <translation>断点条件</translation>
     </message>
     <message>
-        <location filename="editor.cpp" line="4112"/>
+        <location filename="editor.cpp" line="4152"/>
         <source>Enter the condition of the breakpoint:</source>
         <translation>输入当前断点的生效条件:</translation>
     </message>
     <message>
-        <location filename="editor.cpp" line="4326"/>
+        <location filename="editor.cpp" line="4367"/>
         <source>Readonly</source>
         <translation>只读</translation>
     </message>
@@ -3774,11 +3772,11 @@ Are you really want to continue?</oldsource>
     <message>
         <location filename="mainwindow.ui" line="560"/>
         <location filename="mainwindow.ui" line="2637"/>
-        <location filename="mainwindow.cpp" line="4302"/>
-        <location filename="mainwindow.cpp" line="4305"/>
-        <location filename="mainwindow.cpp" line="4309"/>
-        <location filename="mainwindow.cpp" line="4312"/>
-        <location filename="mainwindow.cpp" line="5954"/>
+        <location filename="mainwindow.cpp" line="4303"/>
+        <location filename="mainwindow.cpp" line="4306"/>
+        <location filename="mainwindow.cpp" line="4310"/>
+        <location filename="mainwindow.cpp" line="4313"/>
+        <location filename="mainwindow.cpp" line="5955"/>
         <source>Issues</source>
         <translation>编译器</translation>
     </message>
@@ -4201,7 +4199,7 @@ Are you really want to continue?</oldsource>
     <message>
         <location filename="mainwindow.ui" line="359"/>
         <location filename="mainwindow.ui" line="362"/>
-        <location filename="mainwindow.cpp" line="6268"/>
+        <location filename="mainwindow.cpp" line="6269"/>
         <source>New Problem Set</source>
         <translation>新建试题集</translation>
     </message>
@@ -4220,14 +4218,14 @@ Are you really want to continue?</oldsource>
     <message>
         <location filename="mainwindow.ui" line="401"/>
         <location filename="mainwindow.ui" line="404"/>
-        <location filename="mainwindow.cpp" line="6311"/>
+        <location filename="mainwindow.cpp" line="6312"/>
         <source>Save Problem Set</source>
         <translation>保存试题集</translation>
     </message>
     <message>
         <location filename="mainwindow.ui" line="415"/>
         <location filename="mainwindow.ui" line="418"/>
-        <location filename="mainwindow.cpp" line="6335"/>
+        <location filename="mainwindow.cpp" line="6336"/>
         <source>Load Problem Set</source>
         <translation>载入试题集</translation>
     </message>
@@ -4566,7 +4564,7 @@ Are you really want to continue?</oldsource>
     </message>
     <message>
         <location filename="mainwindow.ui" line="2312"/>
-        <location filename="mainwindow.cpp" line="5171"/>
+        <location filename="mainwindow.cpp" line="5172"/>
         <source>Clear all breakpoints</source>
         <translation>删除所有断点</translation>
     </message>
@@ -4667,7 +4665,7 @@ Are you really want to continue?</oldsource>
     </message>
     <message>
         <location filename="mainwindow.ui" line="2466"/>
-        <location filename="mainwindow.cpp" line="5895"/>
+        <location filename="mainwindow.cpp" line="5896"/>
         <source>Rename Symbol</source>
         <translation>重命名符号</translation>
     </message>
@@ -4688,13 +4686,13 @@ Are you really want to continue?</oldsource>
     </message>
     <message>
         <location filename="mainwindow.ui" line="2486"/>
-        <location filename="mainwindow.cpp" line="6083"/>
+        <location filename="mainwindow.cpp" line="6084"/>
         <source>Export As RTF</source>
         <translation>导出为RTF</translation>
     </message>
     <message>
         <location filename="mainwindow.ui" line="2491"/>
-        <location filename="mainwindow.cpp" line="6105"/>
+        <location filename="mainwindow.cpp" line="6106"/>
         <source>Export As HTML</source>
         <translation>导出为HTML</translation>
     </message>
@@ -5174,7 +5172,7 @@ Are you really want to continue?</oldsource>
     </message>
     <message>
         <location filename="mainwindow.cpp" line="277"/>
-        <location filename="mainwindow.cpp" line="6277"/>
+        <location filename="mainwindow.cpp" line="6278"/>
         <source>Problem Set %1</source>
         <translation>试题集%1</translation>
     </message>
@@ -5248,15 +5246,15 @@ Are you really want to continue?</oldsource>
     </message>
     <message>
         <location filename="mainwindow.cpp" line="2339"/>
-        <location filename="mainwindow.cpp" line="6164"/>
-        <location filename="mainwindow.cpp" line="6204"/>
+        <location filename="mainwindow.cpp" line="6165"/>
+        <location filename="mainwindow.cpp" line="6205"/>
         <source>Bookmark Description</source>
         <translation>书签描述</translation>
     </message>
     <message>
         <location filename="mainwindow.cpp" line="2340"/>
-        <location filename="mainwindow.cpp" line="6165"/>
-        <location filename="mainwindow.cpp" line="6205"/>
+        <location filename="mainwindow.cpp" line="6166"/>
+        <location filename="mainwindow.cpp" line="6206"/>
         <source>Description:</source>
         <translation>描述：</translation>
     </message>
@@ -5377,7 +5375,7 @@ Are you really want to continue?</oldsource>
         <location filename="mainwindow.cpp" line="2737"/>
         <location filename="mainwindow.cpp" line="3589"/>
         <location filename="mainwindow.cpp" line="3595"/>
-        <location filename="mainwindow.cpp" line="5756"/>
+        <location filename="mainwindow.cpp" line="5757"/>
         <source>Delete</source>
         <translation>删除</translation>
     </message>
@@ -5454,7 +5452,7 @@ Are you really want to continue?</oldsource>
     </message>
     <message>
         <location filename="mainwindow.cpp" line="3802"/>
-        <location filename="mainwindow.cpp" line="6271"/>
+        <location filename="mainwindow.cpp" line="6272"/>
         <source>Do you want to save it?</source>
         <translation>需要保存吗？</translation>
     </message>
@@ -5478,141 +5476,141 @@ Are you really want to continue?</oldsource>
         <location filename="mainwindow.cpp" line="4049"/>
         <location filename="mainwindow.cpp" line="4059"/>
         <location filename="mainwindow.cpp" line="4071"/>
-        <location filename="mainwindow.cpp" line="6324"/>
+        <location filename="mainwindow.cpp" line="6325"/>
         <source>Save Error</source>
         <translation>保存失败</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="4230"/>
+        <location filename="mainwindow.cpp" line="4231"/>
         <source>Change Project Compiler Set</source>
         <translation>改变项目编译器配置集</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="4231"/>
+        <location filename="mainwindow.cpp" line="4232"/>
         <source>Change the project&apos;s compiler set will lose all custom compiler set options.</source>
         <translation>改变项目的编译器配置集会导致所有的自定义编译器选项被重置。</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="4233"/>
+        <location filename="mainwindow.cpp" line="4234"/>
         <source>Do you really want to do that?</source>
         <translation>你真的想要做那些吗？</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5172"/>
+        <location filename="mainwindow.cpp" line="5173"/>
         <source>Do you really want to clear all breakpoints in this file?</source>
         <translation>您真的要清除该文件的所有断点吗？</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5370"/>
+        <location filename="mainwindow.cpp" line="5371"/>
         <source>New project</source>
         <translation>新建项目</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5371"/>
+        <location filename="mainwindow.cpp" line="5372"/>
         <source>Close %1 and start new project?</source>
         <translation>关闭&apos;%1&apos;以打开新项目?</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5384"/>
+        <location filename="mainwindow.cpp" line="5385"/>
         <source>Folder not exist</source>
         <translation>文件夹不存在</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5385"/>
+        <location filename="mainwindow.cpp" line="5386"/>
         <source>Folder &apos;%1&apos; doesn&apos;t exist. Create it now?</source>
         <translation>文件夹&apos;%1&apos;不存在。是否创建？</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5392"/>
+        <location filename="mainwindow.cpp" line="5393"/>
         <source>Can&apos;t create folder</source>
         <translation>无法创建文件夹</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5393"/>
+        <location filename="mainwindow.cpp" line="5394"/>
         <source>Failed to create folder &apos;%1&apos;.</source>
         <translation>创建文件夹&apos;%1&apos;失败。</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5408"/>
+        <location filename="mainwindow.cpp" line="5409"/>
         <source>Save new project as</source>
         <translation></translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5757"/>
+        <location filename="mainwindow.cpp" line="5758"/>
         <source>Folder %1 is not empty.</source>
         <translation>文件夹%1不是空的。</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5758"/>
+        <location filename="mainwindow.cpp" line="5759"/>
         <source>Do you really want to delete it?</source>
         <translation>你真的要删除它吗？</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6849"/>
+        <location filename="mainwindow.cpp" line="6850"/>
         <source>Can&apos;t Commit</source>
         <translation>无法提交</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6850"/>
+        <location filename="mainwindow.cpp" line="6851"/>
         <source>Git needs user info to commit.</source>
         <translation>Git需要用信息进行提交。</translation>
     </message>
     <message>
         <location filename="mainwindow.ui" line="2556"/>
         <location filename="mainwindow.ui" line="2559"/>
-        <location filename="mainwindow.cpp" line="6247"/>
+        <location filename="mainwindow.cpp" line="6248"/>
         <source>Choose Working Folder</source>
         <translation>选择工作文件夹</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6617"/>
-        <location filename="mainwindow.cpp" line="6669"/>
+        <location filename="mainwindow.cpp" line="6618"/>
+        <location filename="mainwindow.cpp" line="6670"/>
         <source>Header Exists</source>
         <translation>头文件已存在</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6618"/>
-        <location filename="mainwindow.cpp" line="6670"/>
+        <location filename="mainwindow.cpp" line="6619"/>
+        <location filename="mainwindow.cpp" line="6671"/>
         <source>Header file &quot;%1&quot; already exists!</source>
         <translation>头文件&quot;%1&quot;已存在！</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6675"/>
+        <location filename="mainwindow.cpp" line="6676"/>
         <source>Source Exists</source>
         <translation>源文件已存在！</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6676"/>
+        <location filename="mainwindow.cpp" line="6677"/>
         <source>Source file &quot;%1&quot; already exists!</source>
         <translation>源文件&quot;%1&quot;已存在！</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6828"/>
+        <location filename="mainwindow.cpp" line="6829"/>
         <source>Can&apos;t commit!</source>
         <translation>无法提交！</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6829"/>
+        <location filename="mainwindow.cpp" line="6830"/>
         <source>The following files are in conflicting:</source>
         <translation>下列文件处于冲突状态，请解决后重新添加和提交：</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6834"/>
+        <location filename="mainwindow.cpp" line="6835"/>
         <source>Commit Message</source>
         <translation>提交信息</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6834"/>
+        <location filename="mainwindow.cpp" line="6835"/>
         <source>Commit Message:</source>
         <translation>提交信息：</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6837"/>
+        <location filename="mainwindow.cpp" line="6838"/>
         <source>Commit Failed</source>
         <translation>提交失败</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6838"/>
+        <location filename="mainwindow.cpp" line="6839"/>
         <source>Commit message shouldn&apos;t be empty!</source>
         <translation>提交信息不能为空！</translation>
     </message>
@@ -5621,125 +5619,125 @@ Are you really want to continue?</oldsource>
         <translation type="vanished">小熊猫Dev-C++项目文件 (*.dev)</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5421"/>
+        <location filename="mainwindow.cpp" line="5422"/>
         <source>New project fail</source>
         <translation>新建项目失败</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5422"/>
+        <location filename="mainwindow.cpp" line="5423"/>
         <source>Can&apos;t assign project template</source>
         <translation>无法使用模板创建项目</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5517"/>
+        <location filename="mainwindow.cpp" line="5518"/>
         <source>Remove file</source>
         <translation>删除文件</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5518"/>
+        <location filename="mainwindow.cpp" line="5519"/>
         <source>Remove the file from disk?</source>
         <translation>同时从硬盘上删除文件？</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5707"/>
+        <location filename="mainwindow.cpp" line="5708"/>
         <source>untitled</source>
         <translation>无标题</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5717"/>
+        <location filename="mainwindow.cpp" line="5718"/>
         <source>New Project File Name</source>
         <translation>新的项目文件名</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5718"/>
+        <location filename="mainwindow.cpp" line="5719"/>
         <source>File Name:</source>
         <translation>文件名：</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5724"/>
+        <location filename="mainwindow.cpp" line="5725"/>
         <source>File Already Exists!</source>
         <translation>文件已存在！</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5725"/>
+        <location filename="mainwindow.cpp" line="5726"/>
         <source>File &apos;%1&apos; already exists!</source>
         <translation>文件&apos;%1&apos;已经存在！</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5466"/>
+        <location filename="mainwindow.cpp" line="5467"/>
         <source>Add to project</source>
         <translation>添加到项目</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5410"/>
+        <location filename="mainwindow.cpp" line="5411"/>
         <source>Red Panda C++ project file (*.dev)</source>
         <translation>小熊猫C++项目文件(*.dev)</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5881"/>
+        <location filename="mainwindow.cpp" line="5882"/>
         <source>Rename Error</source>
         <translation>重命名出错</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5882"/>
+        <location filename="mainwindow.cpp" line="5883"/>
         <source>Symbol &apos;%1&apos; is defined in system header.</source>
         <translation>符号&apos;%1&apos;在系统头文件中定义，无法修改。</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="5896"/>
+        <location filename="mainwindow.cpp" line="5897"/>
         <source>New Name</source>
         <translation>新名称</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6028"/>
-        <location filename="mainwindow.cpp" line="6038"/>
+        <location filename="mainwindow.cpp" line="6029"/>
+        <location filename="mainwindow.cpp" line="6039"/>
         <source>Replace Error</source>
         <translation>替换出错</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6029"/>
+        <location filename="mainwindow.cpp" line="6030"/>
         <source>Can&apos;t open file &apos;%1&apos; for replace!</source>
         <translation>无法打开文件&apos;%1&apos;进行替换！</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6039"/>
+        <location filename="mainwindow.cpp" line="6040"/>
         <source>Contents has changed since last search!</source>
         <translation>内容和上次查找时不一致。</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6085"/>
+        <location filename="mainwindow.cpp" line="6086"/>
         <source>Rich Text Format Files (*.rtf)</source>
         <translation>RTF格式文件 (*.rtf)</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6107"/>
+        <location filename="mainwindow.cpp" line="6108"/>
         <source>HTML Files (*.html)</source>
         <translation>HTML文件 (*.html)</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6269"/>
+        <location filename="mainwindow.cpp" line="6270"/>
         <source>The current problem set is not empty.</source>
         <translation>当前的试题集不是空的。</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6287"/>
+        <location filename="mainwindow.cpp" line="6288"/>
         <source>Problem %1</source>
         <translation>试题%1</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6313"/>
-        <location filename="mainwindow.cpp" line="6337"/>
+        <location filename="mainwindow.cpp" line="6314"/>
+        <location filename="mainwindow.cpp" line="6338"/>
         <source>Problem Set Files (*.pbs)</source>
         <translation>试题集文件 (*.pbs)</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6343"/>
+        <location filename="mainwindow.cpp" line="6344"/>
         <source>Load Error</source>
         <translation>载入失败</translation>
     </message>
     <message>
         <location filename="mainwindow.cpp" line="3478"/>
-        <location filename="mainwindow.cpp" line="6357"/>
+        <location filename="mainwindow.cpp" line="6358"/>
         <source>Problem Case %1</source>
         <translation>试题案例%1</translation>
     </message>
@@ -5755,10 +5753,10 @@ Are you really want to continue?</oldsource>
         <location filename="mainwindow.cpp" line="2876"/>
         <location filename="mainwindow.cpp" line="3896"/>
         <location filename="mainwindow.cpp" line="4007"/>
-        <location filename="mainwindow.cpp" line="4199"/>
-        <location filename="mainwindow.cpp" line="4211"/>
-        <location filename="mainwindow.cpp" line="4619"/>
-        <location filename="mainwindow.cpp" line="4631"/>
+        <location filename="mainwindow.cpp" line="4200"/>
+        <location filename="mainwindow.cpp" line="4212"/>
+        <location filename="mainwindow.cpp" line="4620"/>
+        <location filename="mainwindow.cpp" line="4632"/>
         <source>Error</source>
         <translation>错误</translation>
     </message>
@@ -5810,50 +5808,50 @@ Are you really want to continue?</oldsource>
         <translation>打开</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="4395"/>
+        <location filename="mainwindow.cpp" line="4396"/>
         <source>Compile Failed</source>
         <translation>编译失败</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="4401"/>
+        <location filename="mainwindow.cpp" line="4402"/>
         <source>Run Failed</source>
         <translation>运行失败</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="4648"/>
-        <location filename="mainwindow.cpp" line="4662"/>
+        <location filename="mainwindow.cpp" line="4649"/>
+        <location filename="mainwindow.cpp" line="4663"/>
         <source>Confirm Convertion</source>
         <translation>确认转换</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="4649"/>
-        <location filename="mainwindow.cpp" line="4663"/>
+        <location filename="mainwindow.cpp" line="4650"/>
+        <location filename="mainwindow.cpp" line="4664"/>
         <source>The editing file will be saved using %1 encoding. &lt;br /&gt;This operation can&apos;t be reverted. &lt;br /&gt;Are you sure to continue?</source>
         <translation>当前编辑器中的文件将会使用%1编码保存。&lt;br /&gt;这项操作无法被撤回。&lt;br /&gt;你确定要继续吗？</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="4813"/>
+        <location filename="mainwindow.cpp" line="4814"/>
         <source>New Watch Expression</source>
         <translation>新监视表达式</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="4814"/>
+        <location filename="mainwindow.cpp" line="4815"/>
         <source>Enter Watch Expression (it is recommended to use &apos;this-&gt;&apos; for class members):</source>
         <translation>输入监视表达式</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="4867"/>
+        <location filename="mainwindow.cpp" line="4868"/>
         <source>Parsing file %1 of %2: &quot;%3&quot;</source>
         <translation>（%1/%2）正在解析文件&quot;%3&quot;</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="4889"/>
-        <location filename="mainwindow.cpp" line="4895"/>
+        <location filename="mainwindow.cpp" line="4890"/>
+        <location filename="mainwindow.cpp" line="4896"/>
         <source>Done parsing %1 files in %2 seconds</source>
         <translation>完成%1个文件的解析,用时%2秒</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="4892"/>
+        <location filename="mainwindow.cpp" line="4893"/>
         <source>(%1 files per second)</source>
         <translation>(每秒%1个文件）</translation>
     </message>
@@ -6832,7 +6830,7 @@ Are you really want to continue?</oldsource>
 <context>
     <name>QApplication</name>
     <message>
-        <location filename="main.cpp" line="392"/>
+        <location filename="main.cpp" line="396"/>
         <source>Error</source>
         <translation>错误</translation>
     </message>
@@ -6902,205 +6900,205 @@ Are you really want to continue?</oldsource>
         <translation>无法写入配置文件夹&quot;%1&quot;</translation>
     </message>
     <message>
-        <location filename="main.cpp" line="346"/>
+        <location filename="main.cpp" line="350"/>
         <source>Can&apos;t load autolink settings</source>
         <translation>无法载入自动链接设置</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="1559"/>
-        <location filename="settings.cpp" line="1578"/>
+        <location filename="settings.cpp" line="1571"/>
         <location filename="settings.cpp" line="1590"/>
         <location filename="settings.cpp" line="1602"/>
+        <location filename="settings.cpp" line="1614"/>
         <source>The following %1 directories don&apos;t exist:</source>
         <translation>下列%1文件夹不存在：</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="1560"/>
-        <location filename="settings.cpp" line="1570"/>
+        <location filename="settings.cpp" line="1572"/>
+        <location filename="settings.cpp" line="1582"/>
         <source>binary</source>
         <translation>二进制</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="1569"/>
+        <location filename="settings.cpp" line="1581"/>
         <source>No %1 directories have been specified.</source>
         <translation>未指定%1文件夹</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="1579"/>
+        <location filename="settings.cpp" line="1591"/>
         <source>C include</source>
         <translation>C包含</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="1591"/>
         <location filename="settings.cpp" line="1603"/>
+        <location filename="settings.cpp" line="1615"/>
         <source>C++ include</source>
         <translation>C++包含</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="1622"/>
-        <location filename="settings.cpp" line="1627"/>
-        <location filename="settings.cpp" line="1632"/>
-        <location filename="settings.cpp" line="1637"/>
+        <location filename="settings.cpp" line="1634"/>
+        <location filename="settings.cpp" line="1639"/>
+        <location filename="settings.cpp" line="1644"/>
+        <location filename="settings.cpp" line="1649"/>
         <source>Cannot find the %1 &quot;%2&quot;</source>
         <translation>无法找到%1程序&quot;%2&quot;</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="1623"/>
+        <location filename="settings.cpp" line="1635"/>
         <source>C Compiler</source>
         <translation>C编译器</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="1628"/>
+        <location filename="settings.cpp" line="1640"/>
         <source>C++ Compiler</source>
         <translation>C++编译器</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="1633"/>
+        <location filename="settings.cpp" line="1645"/>
         <source>Maker</source>
         <translation>构建程序(Make)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="1638"/>
+        <location filename="settings.cpp" line="1650"/>
         <source>Debugger</source>
         <translation>调试器</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2166"/>
+        <location filename="settings.cpp" line="2178"/>
         <source>C options</source>
         <translation>C语言选项</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2167"/>
+        <location filename="settings.cpp" line="2179"/>
         <source>Support all ANSI standard C programs (-ansi)</source>
         <translation>支持所有ANSI标准C程序(-ansi)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2168"/>
+        <location filename="settings.cpp" line="2180"/>
         <source>Do not recognize asm,inline or typeof as a keyword (-fno-asm)</source>
         <translation>不支持将asm、inline和typeof作为关键字(-fno-asm)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2169"/>
+        <location filename="settings.cpp" line="2181"/>
         <source>Imitate traditional C preprocessors (-traditional-cpp)</source>
         <translation>模仿传统C预处理器行为(-traditional-cpp)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2172"/>
+        <location filename="settings.cpp" line="2184"/>
         <source>Code Generation</source>
         <translation>代码生成</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2201"/>
+        <location filename="settings.cpp" line="2213"/>
         <source>Optimize for the following machine (-march)</source>
         <translation>生成特定机器的专用指令(-march)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2202"/>
+        <location filename="settings.cpp" line="2214"/>
         <source>Optimize less, while maintaining full compatibility (-tune)</source>
         <translation>完整兼容特定机器，较少优化(-tune)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2222"/>
+        <location filename="settings.cpp" line="2234"/>
         <source>Enable use of specific instructions (-mx)</source>
         <translation>启用特定指令集(-mx)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2233"/>
+        <location filename="settings.cpp" line="2245"/>
         <source>Optimization level (-Ox)</source>
         <translation>优化级别(-Ox)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2240"/>
+        <location filename="settings.cpp" line="2252"/>
         <source>Compile with the following pointer size (-mx)</source>
         <translation>使用下列指针大小编译(-mx)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2263"/>
+        <location filename="settings.cpp" line="2275"/>
         <source>Language standard (-std)</source>
         <translation>语言标准(-std)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2276"/>
+        <location filename="settings.cpp" line="2288"/>
         <source>Profile</source>
         <translation>性能分析</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2285"/>
+        <location filename="settings.cpp" line="2297"/>
         <source>Generate debugging information (-g3)</source>
         <translation>生成调试信息(-g3)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2672"/>
+        <location filename="settings.cpp" line="2684"/>
         <source>Would you like Red Panda C++ to search for compilers in PATH?</source>
         <translation>您同意小熊猫C++在PATH路径中寻找gcc编译器吗？</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2277"/>
+        <location filename="settings.cpp" line="2289"/>
         <source>Generate profiling info for analysis (-pg)</source>
         <translation>生成性能分析信息(-pg)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2266"/>
+        <location filename="settings.cpp" line="2278"/>
         <source>Warnings</source>
         <translation>代码警告</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2267"/>
+        <location filename="settings.cpp" line="2279"/>
         <source>Inhibit all warning messages (-w)</source>
         <translation>忽略所有警告信息(-w)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2268"/>
+        <location filename="settings.cpp" line="2280"/>
         <source>Show most warnings (-Wall)</source>
         <translation>启用常见问题警告(-Wall)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2269"/>
+        <location filename="settings.cpp" line="2281"/>
         <source>Show some more warnings (-Wextra)</source>
         <translation>启用更多问题警告(-Wextra)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2270"/>
+        <location filename="settings.cpp" line="2282"/>
         <source>Check ISO C/C++/C++0x conformance (-pedantic)</source>
         <translation>检查ISO C/C++/C++0x语法一致性(-pedantic)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2271"/>
+        <location filename="settings.cpp" line="2283"/>
         <source>Only check the code for syntax errors (-fsyntax-only)</source>
         <translation>只进行语法检查（不编译）(-fsyntax-only)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2272"/>
+        <location filename="settings.cpp" line="2284"/>
         <source>Make all warnings into errors (-Werror)</source>
         <translation>将警告作为错误处理(-Werror)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2273"/>
+        <location filename="settings.cpp" line="2285"/>
         <source>Abort compilation on first error (-Wfatal-errors)</source>
         <translation>遇到第一个错误后立即中止编译(-Wfatal-errors)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2280"/>
+        <location filename="settings.cpp" line="2292"/>
         <source>Linker</source>
         <translation>链接器</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2281"/>
+        <location filename="settings.cpp" line="2293"/>
         <source>Link an Objective C program (-lobjc)</source>
         <translation>链接Objective-C程序 (-lobjc)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2282"/>
+        <location filename="settings.cpp" line="2294"/>
         <source>Do not use standard system libraries (-nostdlib)</source>
         <translation>不使用标准库和系统启动文件(-nostdlib)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2283"/>
+        <location filename="settings.cpp" line="2295"/>
         <source>Do not create a console window (-mwindows)</source>
         <translation>不产生控制台窗口(-mwindows)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2284"/>
+        <location filename="settings.cpp" line="2296"/>
         <source>Strip executable (-s)</source>
         <translation>剥除附加信息(-s)</translation>
     </message>
@@ -7109,54 +7107,54 @@ Are you really want to continue?</oldsource>
         <translation type="vanished">链接Ojbective C程序(-lobjc)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2288"/>
+        <location filename="settings.cpp" line="2300"/>
         <source>Output</source>
         <translation>输出</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2289"/>
+        <location filename="settings.cpp" line="2301"/>
         <source>Put comments in generated assembly code (-fverbose-asm)</source>
         <translation>在生成的汇编代码中加入注释(-fverbose-asm)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2291"/>
+        <location filename="settings.cpp" line="2303"/>
         <source>Use pipes instead of temporary files during compilation (-pipe)</source>
         <translation>编译时使用管道而不是临时文件(-pipe)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2290"/>
+        <location filename="settings.cpp" line="2302"/>
         <source>Do not assemble, compile and generate the assemble code (-S)</source>
         <translation>只生成汇编代码(-S)</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2634"/>
-        <location filename="settings.cpp" line="2674"/>
+        <location filename="settings.cpp" line="2646"/>
+        <location filename="settings.cpp" line="2686"/>
         <source>Confirm</source>
         <translation>确认</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2635"/>
+        <location filename="settings.cpp" line="2647"/>
         <source>The following problems were found during validation of compiler set &quot;%1&quot;:</source>
         <translation>在验证编译器设置&quot;%1&quot;时遇到了下列问题：</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2639"/>
+        <location filename="settings.cpp" line="2651"/>
         <source>Would you like Red Panda C++ to remove them for you and add the default paths to the valid paths?</source>
         <translation>是否让小熊猫C++删除这些配置，并尝试重新建立配置？</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2641"/>
+        <location filename="settings.cpp" line="2653"/>
         <source>Leaving those directories will lead to problems during compilation.&lt;br /&gt;&lt;br /&gt;Unless you know exactly what you&apos;re doing, it is recommended that you click Yes.</source>
         <translation>如果仍然保留这些设置，可能会导致编译错误。&lt;br /&gt;&lt;br /&gt;请选择“是”，除非您清楚的知道选择“否”的后果，</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2664"/>
-        <location filename="settings.cpp" line="2670"/>
+        <location filename="settings.cpp" line="2676"/>
+        <location filename="settings.cpp" line="2682"/>
         <source>Compiler set not configuared.</source>
         <translation>未配置编译器设置。</translation>
     </message>
     <message>
-        <location filename="settings.cpp" line="2666"/>
+        <location filename="settings.cpp" line="2678"/>
         <source>Would you like Red Panda C++ to search for compilers in the following locations: &lt;BR /&gt;&apos;%1&apos;&lt;BR /&gt;&apos;%2&apos;? </source>
         <translation>您需要小熊猫C++在下列位置搜索编译器吗：&lt;br /&gt;%1&lt;br /&gt;%2</translation>
     </message>
@@ -7996,7 +7994,7 @@ Are you really want to continue?</oldsource>
         <translation>自动链接</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6258"/>
+        <location filename="mainwindow.cpp" line="6259"/>
         <location filename="settingsdialog/settingsdialog.cpp" line="170"/>
         <location filename="settingsdialog/settingsdialog.cpp" line="203"/>
         <location filename="settingsdialog/settingsdialog.cpp" line="209"/>
@@ -8072,15 +8070,15 @@ Are you really want to continue?</oldsource>
         <translation>杂项</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6259"/>
-        <location filename="mainwindow.cpp" line="6572"/>
+        <location filename="mainwindow.cpp" line="6260"/>
+        <location filename="mainwindow.cpp" line="6573"/>
         <location filename="settingsdialog/settingsdialog.cpp" line="203"/>
         <location filename="settingsdialog/settingsdialog.cpp" line="206"/>
         <source>Program Runner</source>
         <translation>程序运行</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="6571"/>
+        <location filename="mainwindow.cpp" line="6572"/>
         <location filename="settingsdialog/settingsdialog.cpp" line="206"/>
         <source>Problem Set</source>
         <translation>试题集</translation>
@@ -8329,8 +8327,8 @@ Are you really want to continue?</oldsource>
 <context>
     <name>SynEdit</name>
     <message>
-        <location filename="qsynedit/TextPainter.cpp" line="1008"/>
-        <location filename="qsynedit/TextPainter.cpp" line="1009"/>
+        <location filename="qsynedit/TextPainter.cpp" line="994"/>
+        <location filename="qsynedit/TextPainter.cpp" line="995"/>
         <source>The highlighter seems to be in an infinite loop</source>
         <translation>高亮处理进入了死循环</translation>
     </message>
@@ -8725,17 +8723,23 @@ Are you really want to continue?</oldsource>
         <translation>鼠标滚轮卷轴速度（行）</translation>
     </message>
     <message>
-        <location filename="settingsdialog/editorgeneralwidget.ui" line="349"/>
+        <location filename="settingsdialog/editorgeneralwidget.ui" line="361"/>
+        <source>Mouse Selection/Dragging Scroll Speed</source>
+        <oldsource>Mouse Selection/Dragging Speed</oldsource>
+        <translation>鼠标选择/拖拽卷轴速度</translation>
+    </message>
+    <message>
+        <location filename="settingsdialog/editorgeneralwidget.ui" line="397"/>
         <source>Show right edge line</source>
         <translation>显示右边缘线</translation>
     </message>
     <message>
-        <location filename="settingsdialog/editorgeneralwidget.ui" line="361"/>
+        <location filename="settingsdialog/editorgeneralwidget.ui" line="409"/>
         <source>Right egde width</source>
         <translation>右边缘宽度</translation>
     </message>
     <message>
-        <location filename="settingsdialog/editorgeneralwidget.ui" line="413"/>
+        <location filename="settingsdialog/editorgeneralwidget.ui" line="461"/>
         <source>Right edge line color</source>
         <translation>右边缘颜色</translation>
     </message>
diff --git a/RedPandaIDE/editor.cpp b/RedPandaIDE/editor.cpp
index 96432248..9de1a001 100644
--- a/RedPandaIDE/editor.cpp
+++ b/RedPandaIDE/editor.cpp
@@ -4253,6 +4253,7 @@ void Editor::applySettings()
     }
 
     setMouseWheelScrollSpeed(pSettings->editor().mouseWheelScrollSpeed());
+    setMouseSelectionScrollSpeed(pSettings->editor().mouseSelectionScrollSpeed());
     invalidate();
 }
 
diff --git a/RedPandaIDE/main.cpp b/RedPandaIDE/main.cpp
index 6814248a..b0527047 100644
--- a/RedPandaIDE/main.cpp
+++ b/RedPandaIDE/main.cpp
@@ -255,9 +255,9 @@ int main(int argc, char *argv[])
         QString settingFilename = getSettingFilename(QString(), firstRun);
         bool openInSingleInstance = false;
         if (!settingFilename.isEmpty() && !firstRun) {
-            Settings settings(settingFilename);
-            settings.load();
-            openInSingleInstance = settings.environment().openFilesInSingleInstance();
+            QSettings envSetting(settingFilename,QSettings::IniFormat);
+            envSetting.beginGroup(SETTING_ENVIRONMENT);
+            openInSingleInstance = envSetting.value("open_files_in_single_instance",false).toBool();
         } else if (!settingFilename.isEmpty() && firstRun)
             openInSingleInstance = false;
         if (openInSingleInstance) {
@@ -281,7 +281,6 @@ int main(int argc, char *argv[])
             }
         }
     }
-
     //Translation must be loaded first
     QTranslator trans,transQt;
     bool firstRun;
@@ -293,7 +292,6 @@ int main(int argc, char *argv[])
         tempFile.remove();
         return -1;
     }
-
     {
         QSettings languageSetting(settingFilename,QSettings::IniFormat);
         languageSetting.beginGroup(SETTING_ENVIRONMENT);
@@ -306,7 +304,6 @@ int main(int argc, char *argv[])
             app.installTranslator(&transQt);
         }
     }
-
     qRegisterMetaType<PCompileIssue>("PCompileIssue");
     qRegisterMetaType<PCompileIssue>("PCompileIssue&");
     qRegisterMetaType<QVector<int>>("QVector<int>");
@@ -342,7 +339,6 @@ int main(int argc, char *argv[])
             pSettings->vcs().detectGitInPath();
         }
         auto settings = std::unique_ptr<Settings>(pSettings);
-
         //Color scheme settings must be loaded after translation
         pColorManager = new ColorManager();
         pIconsManager = new IconsManager();
diff --git a/RedPandaIDE/qsynedit/SynEdit.cpp b/RedPandaIDE/qsynedit/SynEdit.cpp
index 86a3dd3a..f5eb870d 100644
--- a/RedPandaIDE/qsynedit/SynEdit.cpp
+++ b/RedPandaIDE/qsynedit/SynEdit.cpp
@@ -90,7 +90,8 @@ SynEdit::SynEdit(QWidget *parent) : QAbstractScrollArea(parent)
     //  fRightEdge has to be set before FontChanged is called for the first time
     mRightEdge = 80;
 
-    mMouseWheelScrollSpeed = 1;
+    mMouseWheelScrollSpeed = 3;
+    mMouseSelectionScrollSpeed = 1;
 
     mGutter.setRightOffset(21);
     mGutter.connect(&mGutter, &SynGutter::changed, this, &SynEdit::onGutterChanged);
@@ -1804,17 +1805,18 @@ void SynEdit::doMouseScroll(bool isDragging)
     C = pixelsToRowColumn(iMousePos.x(), iMousePos.y());
     C.Row = minMax(C.Row, 1, displayLineCount());
     if (mScrollDeltaX != 0) {
-        setLeftChar(leftChar() + mScrollDeltaX);
+        setLeftChar(leftChar() + mScrollDeltaX * mMouseSelectionScrollSpeed);
         X = leftChar();
         if (mScrollDeltaX > 0) // scrolling right?
             X+=charsInWindow();
         C.Column = X;
     }
     if (mScrollDeltaY != 0) {
+        //qDebug()<<mScrollDeltaY;
         if (QApplication::queryKeyboardModifiers().testFlag(Qt::ShiftModifier))
           setTopLine(mTopLine + mScrollDeltaY * mLinesInWindow);
         else
-          setTopLine(mTopLine + mScrollDeltaY);
+          setTopLine(mTopLine + mScrollDeltaY * mMouseSelectionScrollSpeed);
         Y = mTopLine;
         if (mScrollDeltaY > 0)  // scrolling down?
             Y+=mLinesInWindow - 1;
@@ -2489,17 +2491,15 @@ void SynEdit::computeCaret(int X, int Y)
 
 void SynEdit::computeScroll(int X, int Y, bool isDragging)
 {
-    if (!isDragging) {
-        Qt::MouseButtons buttons = qApp->mouseButtons();
-        if (!buttons.testFlag(Qt::LeftButton))
-            return;
-    }
+    Qt::MouseButtons buttons = qApp->mouseButtons();
+    if (!buttons.testFlag(Qt::LeftButton))
+        return;
     QRect iScrollBounds; // relative to the client area
     int dispX=2,dispY = 2;
-    if (isDragging) {
-        dispX = mCharWidth / 2 -1;
-        dispY = mTextHeight/ 2 -1;
-    }
+//    if (isDragging) {
+//        dispX = mCharWidth / 2 -1;
+//        dispY = mTextHeight/ 2 -1;
+//    }
     int left = mGutterWidth+frameWidth()+dispX;
     int top = frameWidth()+dispY;
     iScrollBounds = QRect(left,
@@ -2529,13 +2529,13 @@ void SynEdit::computeScroll(int X, int Y, bool isDragging)
         mScrollDeltaY = 0;
     }
 
-    if (mScrollDeltaX!=0 || mScrollDeltaY!=0) {
-        if (isDragging) {
-            mScrollTimer->singleShot(100,this,&SynEdit::onDraggingScrollTimeout);
-        } else  {
-            mScrollTimer->singleShot(100,this,&SynEdit::onScrollTimeout);
-        }
+//    if (mScrollDeltaX!=0 || mScrollDeltaY!=0) {
+    if (isDragging) {
+        mScrollTimer->singleShot(100,this,&SynEdit::onDraggingScrollTimeout);
+    } else  {
+        mScrollTimer->singleShot(100,this,&SynEdit::onScrollTimeout);
     }
+//    }
 }
 
 void SynEdit::doBlockIndent()
@@ -3780,6 +3780,16 @@ void SynEdit::onScrolled(int)
     invalidate();
 }
 
+int SynEdit::mouseSelectionScrollSpeed() const
+{
+    return mMouseSelectionScrollSpeed;
+}
+
+void SynEdit::setMouseSelectionScrollSpeed(int newMouseSelectionScrollSpeed)
+{
+    mMouseSelectionScrollSpeed = newMouseSelectionScrollSpeed;
+}
+
 const QFont &SynEdit::fontForNonAscii() const
 {
     return mFontForNonAscii;
@@ -5912,6 +5922,7 @@ void SynEdit::mousePressEvent(QMouseEvent *event)
                 //Selection mode must be set before calling SetBlockBegin
                 setBlockBegin(caretXY());
             }
+            computeScroll(X,Y,false);
         }
     }
 }
@@ -5964,7 +5975,7 @@ void SynEdit::mouseMoveEvent(QMouseEvent *event)
         }
     } else if ((buttons == Qt::LeftButton)) {
         // should we begin scrolling?
-        computeScroll(X, Y,false);
+        //computeScroll(X, Y,false);
         DisplayCoord P = pixelsToNearestRowColumn(X, Y);
         P.Row = minMax(P.Row, 1, displayLineCount());
         if (mScrollDeltaX != 0)
@@ -6076,6 +6087,8 @@ void SynEdit::dragEnterEvent(QDragEnterEvent *event)
         setBlockBegin(mDragSelBeginSave);
         setBlockEnd(mDragSelEndSave);
         showCaret();
+        computeScroll(event->pos().x(),
+                      event->pos().y(),true);
     }
 }
 
@@ -6146,8 +6159,8 @@ void SynEdit::dragMoveEvent(QDragMoveEvent *event)
         event->setDropAction(Qt::MoveAction);
     }
     // should we begin scrolling?
-    computeScroll(event->pos().x(),
-                  event->pos().y(),true);
+//    computeScroll(event->pos().x(),
+//                  event->pos().y(),true);
 
     BufferCoord coord = displayToBufferPos(pixelsToNearestRowColumn(event->pos().x(),
                                                                     event->pos().y()));
diff --git a/RedPandaIDE/qsynedit/SynEdit.h b/RedPandaIDE/qsynedit/SynEdit.h
index 81352f5d..eafe37ec 100644
--- a/RedPandaIDE/qsynedit/SynEdit.h
+++ b/RedPandaIDE/qsynedit/SynEdit.h
@@ -723,6 +723,7 @@ private:
     QString mInputPreeditString;
 
     int mMouseWheelScrollSpeed;
+    int mMouseSelectionScrollSpeed;
 
     BufferCoord mDragCaretSave;
     BufferCoord mDragSelBeginSave;
@@ -760,6 +761,9 @@ QVariant inputMethodQuery(Qt::InputMethodQuery property) const override;
 const QFont &fontForNonAscii() const;
 void setFontForNonAscii(const QFont &newFontForNonAscii);
 
+int mouseSelectionScrollSpeed() const;
+void setMouseSelectionScrollSpeed(int newMouseSelectionScrollSpeed);
+
 protected:
 void dragEnterEvent(QDragEnterEvent *event) override;
 void dropEvent(QDropEvent *event) override;
diff --git a/RedPandaIDE/qsynedit/TextPainter.cpp b/RedPandaIDE/qsynedit/TextPainter.cpp
index 70f4e42a..415a5942 100644
--- a/RedPandaIDE/qsynedit/TextPainter.cpp
+++ b/RedPandaIDE/qsynedit/TextPainter.cpp
@@ -431,7 +431,6 @@ void SynEditTextPainter::PaintToken(const QString &Token, int TokenCols, int Col
                             textToPaint+=Token[i];
                         }
                         painter->drawText(nX,rcToken.bottom()-painter->fontMetrics().descent() , textToPaint);
-                        qDebug()<<textToPaint;
                         drawed = true;
                     }
                     if (!drawed) {
diff --git a/RedPandaIDE/settings.cpp b/RedPandaIDE/settings.cpp
index 4eb0a4c0..3a340a5b 100644
--- a/RedPandaIDE/settings.cpp
+++ b/RedPandaIDE/settings.cpp
@@ -614,6 +614,16 @@ void Settings::Editor::setNonAsciiFontName(const QString &newNonAsciiFontName)
     mNonAsciiFontName = newNonAsciiFontName;
 }
 
+int Settings::Editor::mouseSelectionScrollSpeed() const
+{
+    return mMouseSelectionScrollSpeed;
+}
+
+void Settings::Editor::setMouseSelectionScrollSpeed(int newMouseSelectionScrollSpeed)
+{
+    mMouseSelectionScrollSpeed = newMouseSelectionScrollSpeed;
+}
+
 bool Settings::Editor::highlightCurrentWord() const
 {
     return mHighlightCurrentWord;
@@ -1115,6 +1125,7 @@ void Settings::Editor::doSave()
     saveValue("scroll_by_one_less", mScrollByOneLess);
     saveValue("half_page_scroll", mHalfPageScroll);
     saveValue("mouse_wheel_scroll_speed", mMouseWheelScrollSpeed);
+    saveValue("mouse_selection_scroll_speed",mMouseSelectionScrollSpeed);
 
     //right edge
     saveValue("show_right_edge_line",mShowRightEdgeLine);
@@ -1232,6 +1243,7 @@ void Settings::Editor::doLoad()
     mScrollByOneLess = boolValue("scroll_by_one_less", false);
     mHalfPageScroll = boolValue("half_page_scroll",false);
     mMouseWheelScrollSpeed = intValue("mouse_wheel_scroll_speed", 3);
+    mMouseSelectionScrollSpeed = intValue("mouse_selection_scroll_speed",1);
 
 
     //right edge
diff --git a/RedPandaIDE/settings.h b/RedPandaIDE/settings.h
index 6f0f4059..712c6d88 100644
--- a/RedPandaIDE/settings.h
+++ b/RedPandaIDE/settings.h
@@ -372,6 +372,9 @@ public:
         const QString &nonAsciiFontName() const;
         void setNonAsciiFontName(const QString &newNonAsciiFontName);
 
+        int mouseSelectionScrollSpeed() const;
+        void setMouseSelectionScrollSpeed(int newMouseSelectionScrollSpeed);
+
     private:
         //General
         // indents
@@ -401,6 +404,7 @@ public:
         bool mScrollByOneLess;
         bool mHalfPageScroll;
         int mMouseWheelScrollSpeed;
+        int mMouseSelectionScrollSpeed;
 
         //right margin
         bool mShowRightEdgeLine;
diff --git a/RedPandaIDE/settingsdialog/editorgeneralwidget.cpp b/RedPandaIDE/settingsdialog/editorgeneralwidget.cpp
index f1a52b76..1ac0d057 100644
--- a/RedPandaIDE/settingsdialog/editorgeneralwidget.cpp
+++ b/RedPandaIDE/settingsdialog/editorgeneralwidget.cpp
@@ -78,6 +78,7 @@ void EditorGeneralWidget::doLoad()
     ui->chkScrollHalfPage->setChecked(pSettings->editor().halfPageScroll());
     ui->chkScrollByOneLess->setChecked(pSettings->editor().scrollByOneLess());
     ui->spinMouseWheelScrollSpeed->setValue(pSettings->editor().mouseWheelScrollSpeed());
+    ui->spinMouseSelectionScrollSpeed->setValue(pSettings->editor().mouseSelectionScrollSpeed());
 
     //right margin line;
     ui->grpRightEdge->setChecked(pSettings->editor().showRightEdgeLine());
@@ -114,6 +115,7 @@ void EditorGeneralWidget::doSave()
     pSettings->editor().setScrollByOneLess(ui->chkScrollByOneLess->isChecked());
     pSettings->editor().setHalfPageScroll(ui->chkScrollHalfPage->isChecked());
     pSettings->editor().setMouseWheelScrollSpeed(ui->spinMouseWheelScrollSpeed->value());
+    pSettings->editor().setMouseSelectionScrollSpeed(ui->spinMouseSelectionScrollSpeed->value());
 
     //right margin line;
     pSettings->editor().setShowRightEdgeLine(ui->grpRightEdge->isChecked());
diff --git a/RedPandaIDE/settingsdialog/editorgeneralwidget.ui b/RedPandaIDE/settingsdialog/editorgeneralwidget.ui
index 760f4900..47d3a9de 100644
--- a/RedPandaIDE/settingsdialog/editorgeneralwidget.ui
+++ b/RedPandaIDE/settingsdialog/editorgeneralwidget.ui
@@ -340,6 +340,54 @@
         </layout>
        </widget>
       </item>
+      <item>
+       <widget class="QWidget" name="widget_7" native="true">
+        <layout class="QHBoxLayout" name="horizontalLayout_4">
+         <property name="leftMargin">
+          <number>0</number>
+         </property>
+         <property name="topMargin">
+          <number>0</number>
+         </property>
+         <property name="rightMargin">
+          <number>0</number>
+         </property>
+         <property name="bottomMargin">
+          <number>0</number>
+         </property>
+         <item>
+          <widget class="QLabel" name="label_2">
+           <property name="text">
+            <string>Mouse Selection/Dragging Scroll Speed</string>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QSpinBox" name="spinMouseSelectionScrollSpeed">
+           <property name="minimum">
+            <number>1</number>
+           </property>
+           <property name="maximum">
+            <number>100</number>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <spacer name="horizontalSpacer_7">
+           <property name="orientation">
+            <enum>Qt::Horizontal</enum>
+           </property>
+           <property name="sizeHint" stdset="0">
+            <size>
+             <width>40</width>
+             <height>20</height>
+            </size>
+           </property>
+          </spacer>
+         </item>
+        </layout>
+       </widget>
+      </item>
      </layout>
     </widget>
    </item>