diff --git a/NEWS.md b/NEWS.md
index 8caabc6b..83385cd1 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -7,6 +7,7 @@ Red Panda C++ Version 1.1.6
   - enhancement: choose default language when first run
   - fix: Drag&Drop no correctly disabled for readonly editors
   - enhancement: disable column mode in readonly editors
+  - fix: inefficient loop when render long lines
 
 Red Panda C++ Version 1.1.5
 
diff --git a/RedPandaIDE/qsynedit/TextPainter.cpp b/RedPandaIDE/qsynedit/TextPainter.cpp
index e98c2e65..9a118c27 100644
--- a/RedPandaIDE/qsynedit/TextPainter.cpp
+++ b/RedPandaIDE/qsynedit/TextPainter.cpp
@@ -971,7 +971,7 @@ void SynEditTextPainter::paintLines()
                     if (nTokenColumnsBefore + nTokenColumnLen >= vLastChar) {
                         if (nTokenColumnsBefore >= vLastChar)
                             break; //*** BREAK ***
-                        nTokenColumnLen = vLastChar - nTokenColumnsBefore - 1;
+                        nTokenColumnLen = vLastChar - nTokenColumnsBefore;
                     }
                     // It's at least partially visible. Get the token attributes now.
                     attr = edit->mHighlighter->getTokenAttribute();