diff --git a/uhr.js b/uhr.js
index eef10c5..0a1ede0 100644
--- a/uhr.js
+++ b/uhr.js
@@ -288,16 +288,18 @@ function UhrRenderer(layout, renderarea) {
 }
 UhrRenderer.prototype.render = function(uhr, beforeshow) {
 	var renderer = this;
-	var letters;
-	switch (this.layout.version) {
-		case 2:
-			var delegate = new _UhrRendererV2Delegate(this.layout);
-			letters = delegate.parse();
-			break;
-		default:
-			console.warn("Unknown layout version: '" + this.layout.version + "'");
-			return;
+	if (this.layout._parsed === undefined) {
+		switch (this.layout.version) {
+			case 2:
+				var delegate = new _UhrRendererV2Delegate(this.layout);
+				this.layout._parsed = delegate.parse();
+				break;
+			default:
+				console.warn("Unknown layout version: '" + this.layout.version + "'");
+				return;
+		}
 	}
+	var letters = this.layout._parsed;
 	this.renderarea.fadeOut('fast', function() {
 		renderer.renderarea.empty();
 		for (var y = 0; y < letters.length; y++) {
@@ -337,7 +339,7 @@ function _UhrRendererV2Delegate(layout) {
 			}
 		}
 	}
-	this._definitionHelper = function(letters, styleClass, definition) {
+	this._parseTimeDefinition = function(letters, styleClass, definition) {
 		for (listString in definition) {
 			if (definition.hasOwnProperty(listString)) {
 				var array = listString.split(',');
@@ -361,8 +363,8 @@ _UhrRendererV2Delegate.prototype.parse = function() {
 		letters.push(line);
 	}
 	this._parseArrayOrObject(letters, 'on', this.layout.permanent);
-	this._definitionHelper(letters, 'minute', this.layout.minutes);
-	this._definitionHelper(letters, 'hour', this.layout.hours);
+	this._parseTimeDefinition(letters, 'minute', this.layout.minutes);
+	this._parseTimeDefinition(letters, 'hour', this.layout.hours);
 	return letters;
 };
 /**