diff --git a/src/ace/BackgroundTokenizer.js b/src/ace/BackgroundTokenizer.js
index 0f3cb5cc..13986902 100644
--- a/src/ace/BackgroundTokenizer.js
+++ b/src/ace/BackgroundTokenizer.js
@@ -21,12 +21,12 @@ var BackgroundTokenizer = function(tokenizer) {
             self.lines[self.currentLine] = self.$tokenizeRow(self.currentLine);
             self.currentLine++;
 
-            // only check every 30 lines
+            // only check every 5 lines
             processedLines += 1;
-            if ((processedLines % 30 == 0) && (new Date() - workerStart) > 20) {
+            //if ((processedLines % 5 == 0) && (new Date() - workerStart) > 20) {
                 self.fireUpdateEvent(startLine, self.currentLine-1);
-                return setTimeout(self.$worker, 10);
-            }
+                return setTimeout(self.$worker, 0);
+            //}
         }
 
         self.running = false;
@@ -67,11 +67,9 @@ var BackgroundTokenizer = function(tokenizer) {
 
         this.lines.splice(this.currentLine, this.lines.length);
 
-        if (!this.running) {
-            clearTimeout(this.running);
-            // pretty long delay to prevent the tokenizer from interfering with the user
-            this.running = setTimeout(this.$worker, 200);
-        }
+        this.stop();
+        // pretty long delay to prevent the tokenizer from interfering with the user
+        this.running = setTimeout(this.$worker, 200);
     };
 
     this.stop = function() {
diff --git a/src/ace/Editor.js b/src/ace/Editor.js
index 67fe8e64..a144fe24 100644
--- a/src/ace/Editor.js
+++ b/src/ace/Editor.js
@@ -323,8 +323,7 @@ var Editor = function(renderer, doc) {
     };
 
     this.onMouseWheel = function(e) {
-        var delta = e.wheel;
-        this.renderer.scrollToY(this.renderer.getScrollTop() - (delta * 15));
+        this.renderer.scrollBy(e.wheelX, e.wheelY);
         return ace.preventDefault(e);
     };
 
diff --git a/src/ace/Search.js b/src/ace/Search.js
index d5bf1924..0c43a790 100644
--- a/src/ace/Search.js
+++ b/src/ace/Search.js
@@ -1,4 +1,6 @@
-require.def("ace/Search", ["ace/ace"], function(ace) {
+require.def("ace/Search",
+    ["ace/ace", "ace/Range"], 
+    function(ace, Range) {
 
 var Search = function() {
     this.$options = {
@@ -139,10 +141,8 @@ Search.SELECTION = 2;
         };
     };
 
-
-
     this.$rangeFromMatch = function(row, column, length) {
-        return new ace.Range(row, column, row, column+length);
+        return new Range(row, column, row, column+length);
     };
 
     this.$assembleRegExp = function() {
diff --git a/src/ace/VirtualRenderer.js b/src/ace/VirtualRenderer.js
index 5582d377..60cfe9cc 100644
--- a/src/ace/VirtualRenderer.js
+++ b/src/ace/VirtualRenderer.js
@@ -194,7 +194,7 @@ var VirtualRenderer = function(container) {
         this.$textLayer.updateLines(layerConfig, firstRow, lastRow);
     };
 
-    this.draw = function() {
+    this.draw = function(scrollOnly) {
         var lines = this.lines;
 
         var offset = this.scrollTop % this.lineHeight;
@@ -216,7 +216,8 @@ var VirtualRenderer = function(container) {
             lastRow : lastRow,
             lineHeight : this.lineHeight,
             characterWidth : this.characterWidth,
-            minHeight : minHeight
+            minHeight : minHeight,
+            scrollOnly: !!scrollOnly
         };
 
         this.content.style.marginTop = (-offset) + "px";
@@ -309,10 +310,15 @@ var VirtualRenderer = function(container) {
         if (this.scrollTop !== scrollTop) {
             this.scrollTop = scrollTop;
             this.$updateScrollBar();
-            this.draw();
+            this.draw(true);
         }
     };
 
+    this.scrollBy = function(deltaX, deltaY) {
+        deltaY && this.scrollToY(this.scrollTop + deltaY);
+        deltaX && (this.scroller.scrollLeft += deltaX);
+    };
+
     this.screenToTextCoordinates = function(pageX, pageY) {
         var canvasPos = this.scroller.getBoundingClientRect();
 
diff --git a/src/ace/layer/Text.js b/src/ace/layer/Text.js
index 80656192..aab584b1 100644
--- a/src/ace/layer/Text.js
+++ b/src/ace/layer/Text.js
@@ -119,13 +119,74 @@ var Text = function(parentEl) {
         };
     };
 
+    this.$scrollLines = function(oldConfig, config) {
+        if (oldConfig.lastRow < config.firstRow)
+            return this.$fullUpdate(config);
+
+        if (config.lastRow < oldConfig.firstRow)
+            return this.$fullUpdate(config);
+
+        var el = this.element;
+
+        if (oldConfig.firstRow < config.firstRow)
+            for (var row=oldConfig.firstRow; row<config.firstRow; row++)
+                el.removeChild(el.firstChild);
+
+        if (oldConfig.lastRow > config.lastRow)
+            for (var row=config.lastRow+1; row<=oldConfig.lastRow; row++)
+                el.removeChild(el.lastChild);
+
+        if (config.firstRow < oldConfig.firstRow) {
+            var fragment = this.$renderLinesFragment(config, config.firstRow, oldConfig.firstRow - 1);
+            if (el.firstChild)
+                el.insertBefore(fragment, el.firstChild);
+            else
+                el.appendChild(fragment);
+        }
+
+        if (config.lastRow > oldConfig.lastRow) {
+            var fragment = this.$renderLinesFragment(config, oldConfig.lastRow + 1, config.lastRow);
+            el.appendChild(fragment);
+        }
+    };
+
+    this.$renderLinesFragment = function(config, firstRow, lastRow) {
+        var fragment = document.createDocumentFragment();
+        for (var row=firstRow; row<=lastRow; row++) {
+            var lineEl = document.createElement("div");
+            lineEl.className = "ace_line";
+            var style = lineEl.style;
+            style.height = this.$characterSize.height + "px";
+            style.width = config.width + "px";
+
+            var html = [];
+            this.renderLine(html, row);
+            lineEl.innerHTML = html.join("");
+            fragment.appendChild(lineEl);
+        }
+        return fragment;
+    };
+
     this.update = function(config) {
+        if (!config.minHeight)
+            return;
+
         this.$computeTabString();
 
+        if (this.config && config.scrollOnly) {
+            this.$scrollLines(this.config, config);
+        } else {
+            this.$fullUpdate(config);
+        }
+
+        this.config = config;
+    };
+
+    this.$fullUpdate = function(config) {
         var html = [];
         for ( var i = config.firstRow; i <= config.lastRow; i++) {
             html.push("<div class='ace_line' style='height:" + this.$characterSize.height + "px;", "width:",
-                      config.width, "px'>");
+                    config.width, "px'>");
             this.renderLine(html, i), html.push("</div>");
         }
 
@@ -137,7 +198,7 @@ var Text = function(parentEl) {
         "rparen": true,
         "lparen": true
     };
-    
+
     this.renderLine = function(stringBuilder, row) {
         var tokens = this.tokenizer.getTokens(row);
 
diff --git a/src/ace/lib/event.js b/src/ace/lib/event.js
index 9b574da5..f0d4fdae 100644
--- a/src/ace/lib/event.js
+++ b/src/ace/lib/event.js
@@ -110,8 +110,24 @@ require.def("ace/lib/event", ["ace/lib/core"], function(core) {
 
     event.addMouseWheelListener = function(el, callback) {
         var listener = function(e) {
-            e.wheel = (e.wheelDelta) ? e.wheelDelta / 120
-                    : -(e.detail || 0) / 3;
+            if (e.wheelDelta !== undefined) {
+                if (e.wheelDeltaX !== undefined) {
+                    e.wheelX = e.wheelDeltaX / 8;
+                    e.wheelY = e.wheelDeltaY / 8;
+                } else {
+                    e.wheelX = 0;
+                    e.wheelY = e.wheelDelta / 8;
+                }
+            }
+            else {
+                if (e.axis && e.axis == e.HORIZONTAL_AXIS) {
+                    e.wheelX = (e.detail || 0) * 5;
+                    e.wheelY = 0;
+                } else {
+                    e.wheelX = 0;
+                    e.wheelY = (e.detail || 0) * 5;
+                }
+            }
             callback(e);
         };
         event.addListener(el, "DOMMouseScroll", listener);
@@ -158,6 +174,6 @@ require.def("ace/lib/event", ["ace/lib/core"], function(core) {
           });
       }
     };
-    
+
     return event;
 });
\ No newline at end of file
diff --git a/src/ace/lib/lang.js b/src/ace/lib/lang.js
index 3fa304bb..e04bd7ee 100644
--- a/src/ace/lib/lang.js
+++ b/src/ace/lib/lang.js
@@ -43,7 +43,7 @@ require.def("ace/lib/lang", function() {
 
     };
 
-    this.escapeRegExp = function(str) {
+    lang.escapeRegExp = function(str) {
         return str.replace(/([.*+?^${}()|[\]\/\\])/g, '\\$1');
     };