From 82e8ae5a491da2c4ecae63792c44a7f784f18740 Mon Sep 17 00:00:00 2001
From: Joe Cheng <joe@joecheng.com>
Date: Thu, 21 Apr 2011 09:44:48 -0700
Subject: [PATCH] Fix performance regression on large documents

---
 lib/ace/edit_session.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/ace/edit_session.js b/lib/ace/edit_session.js
index 92b79861..83adf78b 100644
--- a/lib/ace/edit_session.js
+++ b/lib/ace/edit_session.js
@@ -1277,7 +1277,11 @@ var EditSession = function(text, mode) {
         return screenRows;
     }
     
+    // For every keystroke this gets called once per char in the whole doc!!
+    // Wouldn't hurt to make it a bit faster for c >= 0x1100
     function isFullWidth(c) {
+        if (c < 0x1100)
+            return false;
         return c >= 0x1100 && c <= 0x115F ||
                c >= 0x11A3 && c <= 0x11A7 ||
                c >= 0x11FA && c <= 0x11FF ||