diff --git a/src/js/Events.js b/src/js/Events.js
index fb2203a3..21eb133b 100644
--- a/src/js/Events.js
+++ b/src/js/Events.js
@@ -5,6 +5,7 @@ var Events = {
   SELECT_TOOL : "SELECT_TOOL",
 
   TOOL_RELEASED : "TOOL_RELEASED",
+  TOOL_PRESSED : "TOOL_PRESSED",
   SELECT_PRIMARY_COLOR: "SELECT_PRIMARY_COLOR",
   SELECT_SECONDARY_COLOR: "SELECT_SECONDARY_COLOR",
   PRIMARY_COLOR_SELECTED : 'PRIMARY_COLOR_SELECTED',
diff --git a/src/js/controller/AnimatedPreviewController.js b/src/js/controller/AnimatedPreviewController.js
index 43269e4a..9d5f2eb4 100644
--- a/src/js/controller/AnimatedPreviewController.js
+++ b/src/js/controller/AnimatedPreviewController.js
@@ -1,5 +1,5 @@
 (function () {
-  var ns = $.namespace("pskl.controller");
+  var ns = $.namespace('pskl.controller');
 
   // Preview is a square of PREVIEW_SIZE x PREVIEW_SIZE
   var PREVIEW_SIZE = 200;
@@ -11,6 +11,11 @@
     this.elapsedTime = 0;
     this.currentIndex = 0;
 
+    this.renderFlag = true;
+
+    this.fpsRangeInput = $('#preview-fps');
+    this.fpsCounterDisplay = $('#display-fps');
+
     this.setFPS(Constants.DEFAULT.FPS);
 
     var frame = this.piskelController.getCurrentFrame();
@@ -22,10 +27,10 @@
     // the oninput event won't work on IE10 unfortunately, but at least will provide a
     // consistent behavior across all other browsers that support the input type range
     // see https://bugzilla.mozilla.org/show_bug.cgi?id=853670
-    $("#preview-fps").on('input change', this.onFPSSliderChange.bind(this));
-    document.querySelector(".right-column").style.width = Constants.ANIMATED_PREVIEW_WIDTH + 'px';
+    this.fpsRangeInput.on('input change', this.onFPSSliderChange.bind(this));
+    document.querySelector('.right-column').style.width = Constants.ANIMATED_PREVIEW_WIDTH + 'px';
 
-    this.toggleOnionSkinEl = document.querySelector(".preview-toggle-onion-skin");
+    this.toggleOnionSkinEl = document.querySelector('.preview-toggle-onion-skin');
     this.toggleOnionSkinEl.addEventListener('click', this.toggleOnionSkin_.bind(this));
 
     pskl.app.shortcutService.addShortcut('alt+O', this.toggleOnionSkin_.bind(this));
@@ -33,6 +38,9 @@
     $.subscribe(Events.FRAME_SIZE_CHANGED, this.onFrameSizeChange_.bind(this));
     $.subscribe(Events.USER_SETTINGS_CHANGED, $.proxy(this.onUserSettingsChange_, this));
 
+    $.subscribe(Events.TOOL_RELEASED, this.setRenderFlag_.bind(this, true));
+    $.subscribe(Events.TOOL_PRESSED, this.setRenderFlag_.bind(this, false));
+
     this.updateZoom_();
     this.updateOnionSkinPreview_();
     this.updateContainerDimensions_();
@@ -78,14 +86,16 @@
   };
 
   ns.AnimatedPreviewController.prototype.onFPSSliderChange = function (evt) {
-    this.setFPS(parseInt($("#preview-fps")[0].value, 10));
+    this.setFPS(parseInt(this.fpsRangeInput[0].value, 10));
+
   };
 
   ns.AnimatedPreviewController.prototype.setFPS = function (fps) {
-    if (fps) {
+    if (typeof fps === 'number') {
       this.fps = fps;
-      $("#preview-fps").val(this.fps);
-      $("#display-fps").html(this.fps + " FPS");
+      this.fpsRangeInput.val(this.fps);
+      this.fpsRangeInput.blur();
+      this.fpsCounterDisplay.html(this.fps + ' FPS');
     }
   };
 
@@ -94,7 +104,24 @@
   };
 
   ns.AnimatedPreviewController.prototype.render = function (delta) {
-    this.elapsedTime += delta;
+    if (this.renderFlag) {
+      this.elapsedTime += delta;
+      if (this.fps === 0) {
+        this._renderSelectedFrame();
+      } else {
+        this._renderCurrentAnimationFrame();
+      }
+    }
+  };
+
+  ns.AnimatedPreviewController.prototype._renderSelectedFrame = function (delta) {
+    // the selected frame is the currentFrame from the PiskelController perspective
+    var selectedFrameIndex = this.piskelController.getCurrentFrameIndex();
+    var selectedFrame = this.piskelController.getFrameAt(selectedFrameIndex);
+    this.renderer.render(selectedFrame);
+  };
+
+  ns.AnimatedPreviewController.prototype._renderCurrentAnimationFrame = function (delta) {
     var index = Math.floor(this.elapsedTime / (1000/this.fps));
     if (index != this.currentIndex) {
       this.currentIndex = index;
@@ -112,9 +139,8 @@
    */
   ns.AnimatedPreviewController.prototype.calculateZoom_ = function () {
     var frame = this.piskelController.getCurrentFrame();
-    var previewSize = 200,
-      hZoom = previewSize / frame.getHeight(),
-      wZoom = previewSize / frame.getWidth();
+    var hZoom = PREVIEW_SIZE / frame.getHeight(),
+        wZoom = PREVIEW_SIZE / frame.getWidth();
 
     return Math.min(hZoom, wZoom);
   };
@@ -139,16 +165,21 @@
       width = frame.getWidth() * zoom;
     }
 
-    containerEl.style.height = height + "px";
-    containerEl.style.width = width + "px";
+    containerEl.style.height = height + 'px';
+    containerEl.style.width = width + 'px';
 
     var horizontalPadding = (PREVIEW_SIZE - height) / 2;
-    containerEl.style.marginTop = horizontalPadding + "px";
-    containerEl.style.marginBottom = horizontalPadding + "px";
+    containerEl.style.marginTop = horizontalPadding + 'px';
+    containerEl.style.marginBottom = horizontalPadding + 'px';
 
     var verticalPadding = (PREVIEW_SIZE - width) / 2;
-    containerEl.style.marginLeft = verticalPadding + "px";
-    containerEl.style.marginRight = verticalPadding + "px";
+    containerEl.style.marginLeft = verticalPadding + 'px';
+    containerEl.style.marginRight = verticalPadding + 'px';
+  };
+
+  ns.AnimatedPreviewController.prototype.setRenderFlag_ = function (bool) {
+    console.log('setRenderFlag_', bool);
+    this.renderFlag = bool;
   };
 
   ns.AnimatedPreviewController.prototype.toggleOnionSkin_ = function () {
diff --git a/src/js/controller/DrawingController.js b/src/js/controller/DrawingController.js
index f8fa153f..f6ed0653 100644
--- a/src/js/controller/DrawingController.js
+++ b/src/js/controller/DrawingController.js
@@ -31,8 +31,6 @@
       "yOffset" : 0
     };
 
-    console.log('DrawingController:getContainerWidth_', this.getContainerWidth_());
-
     this.overlayRenderer = new pskl.rendering.frame.CachedFrameRenderer(this.container, renderingOptions, ["canvas-overlay"]);
     this.renderer = new pskl.rendering.frame.CachedFrameRenderer(this.container, renderingOptions, ["drawing-canvas"]);
     this.onionSkinRenderer = new pskl.rendering.OnionSkinRenderer(this.container, renderingOptions, piskelController);
@@ -153,7 +151,7 @@
       this.dragHandler.startDrag(event.clientX, event.clientY);
     } else {
       this.currentToolBehavior.hideHighlightedPixel(this.overlayFrame);
-
+      $.publish(Events.TOOL_PRESSED);
       this.currentToolBehavior.applyToolAt(
         coords.x,
         coords.y,
diff --git a/src/js/model/frame/CachedFrameProcessor.js b/src/js/model/frame/CachedFrameProcessor.js
index 4f884b91..7e20b9d4 100644
--- a/src/js/model/frame/CachedFrameProcessor.js
+++ b/src/js/model/frame/CachedFrameProcessor.js
@@ -65,7 +65,7 @@
     if (cache[cacheKey]) {
       processedFrame = cache[cacheKey];
     } else {
-      var frameAsString = JSON.stringify(frame.getPixels());
+      var frameAsString = pskl.utils.hashCode(JSON.stringify(frame.getPixels()));
       if (cache[frameAsString]) {
         processedFrame = this.outputCloner(cache[frameAsString], frame);
       } else {
diff --git a/src/js/rendering/frame/FrameRenderer.js b/src/js/rendering/frame/FrameRenderer.js
index ee746b75..9a0eaa74 100644
--- a/src/js/rendering/frame/FrameRenderer.js
+++ b/src/js/rendering/frame/FrameRenderer.js
@@ -164,13 +164,6 @@
     }
   };
 
-  ns.FrameRenderer.prototype.renderPixel_ = function (color, x, y, context) {
-    if(color != Constants.TRANSPARENT_COLOR) {
-      context.fillStyle = color;
-      context.fillRect(x, y, 1, 1);
-    }
-  };
-
   /**
    * Transform a screen pixel-based coordinate (relative to the top-left corner of the rendered
    * frame) into a sprite coordinate in column and row.
@@ -264,4 +257,11 @@
     }
     displayContext.restore();
   };
+
+  ns.FrameRenderer.prototype.renderPixel_ = function (color, x, y, context) {
+    if(color != Constants.TRANSPARENT_COLOR) {
+      context.fillStyle = color;
+      context.fillRect(x, y, 1, 1);
+    }
+  };
 })();
\ No newline at end of file
diff --git a/src/js/utils/core.js b/src/js/utils/core.js
index 2fd92c14..af71c3de 100644
--- a/src/js/utils/core.js
+++ b/src/js/utils/core.js
@@ -89,6 +89,18 @@ if (!Function.prototype.bind) {
     }
   };
 
+  ns.hashCode = function(str) {
+    var hash = 0;
+    if (str.length !== 0) {
+      for (var i = 0, l = str.length; i < l; i++) {
+        var chr = str.charCodeAt(i);
+        hash  = ((hash << 5) - hash) + chr;
+        hash |= 0; // Convert to 32bit integer
+      }
+    }
+    return hash;
+  };
+
   var entityMap = {
     "&": "&amp;",
     "<": "&lt;",
@@ -97,7 +109,6 @@ if (!Function.prototype.bind) {
     "'": '&#39;',
     "/": '&#x2F;'
   };
-
   ns.escapeHtml= function (string) {
     return String(string).replace(/[&<>"'\/]/g, function (s) {
       return entityMap[s];
diff --git a/src/templates/preview.html b/src/templates/preview.html
index b0bfe93e..7c01cca4 100644
--- a/src/templates/preview.html
+++ b/src/templates/preview.html
@@ -10,6 +10,6 @@
          data-placement="bottom"
          class="piskel-icon-onion preview-toggle-onion-skin"></div>
     <span id="display-fps" class="display-fps"></span>
-    <input id="preview-fps" class="range-fps" type="range" min="1" max="24"/>
+    <input id="preview-fps" class="range-fps" type="range" min="0" max="24"/>
   </div>
 </div>
\ No newline at end of file