diff --git a/lib/client/edit.js b/lib/client/edit.js
index e183d90c..9654dae0 100644
--- a/lib/client/edit.js
+++ b/lib/client/edit.js
@@ -81,6 +81,7 @@ var CloudCmd, Util, DOM, CloudFunc, ace, DiffProto, diff_match_patch, Zip;
                 isJS        = mode === jsMode;
                 
                 Session.setMode(mode);
+                setUseOfWorker(mode);
                 
                 Util.ifExec(Emmet, function() {
                     if (Emmet)
@@ -141,6 +142,18 @@ var CloudCmd, Util, DOM, CloudFunc, ace, DiffProto, diff_match_patch, Zip;
                 Ace.gotoLine(number);
         };
         
+        function setUseOfWorker(mode) {
+            var isMatch,
+                isStr   = Util.isString(mode),
+                regStr  = 'coffee/css/html/javascript/json/lua/php/xquery',
+                regExp  = new RegExp(regStr);
+            
+            if (isStr)
+                isMatch = mode.match(regExp);
+            
+            Session.setUseWorker(isMatch);
+        }
+        
         function initAce() {
             Ace     = ace.edit(Element);
             Session = Ace.getSession();