diff --git a/plugins/org.eclipse.actf.visualization.engines.blind.html/src/org/eclipse/actf/visualization/engines/blind/html/VisualizeEngine.java b/plugins/org.eclipse.actf.visualization.engines.blind.html/src/org/eclipse/actf/visualization/engines/blind/html/VisualizeEngine.java
index 9b49c9c..371e4a7 100644
--- a/plugins/org.eclipse.actf.visualization.engines.blind.html/src/org/eclipse/actf/visualization/engines/blind/html/VisualizeEngine.java
+++ b/plugins/org.eclipse.actf.visualization.engines.blind.html/src/org/eclipse/actf/visualization/engines/blind/html/VisualizeEngine.java
@@ -67,6 +67,8 @@
 
 	private static final String CHECK_ITEM_PATTERN = "B_\\p{Digit}+"; //$NON-NLS-1$
 
+	private static final boolean DEBUG = false;
+
 	private String baseUrl = ""; // default value //$NON-NLS-1$
 
 	private String targetUrl = ""; //$NON-NLS-1$
@@ -155,23 +157,31 @@
 		// TODO move to screen reader engine
 		DocumentCleaner.removeDisplayNone(document);
 
-		DebugPrintUtil.devOrDebugPrintln("remove display none\t" + (new Date()).getTime());
-		
+		if (DEBUG)
+			DebugPrintUtil.debugPrintln("remove display none\t"
+					+ (new Date()).getTime());
+
 		orig = document;
 		result = (Document) document.cloneNode(true);
 
-		DebugPrintUtil.devOrDebugPrintln("clone node\t" + (new Date()).getTime());
-		
+		if (DEBUG)
+			DebugPrintUtil.debugPrintln("clone node\t"
+					+ (new Date()).getTime());
+
 		jwatc.setDocument(result);
-		
-		DebugPrintUtil.devOrDebugPrintln("jwatc\t" + (new Date()).getTime());
+
+		if (DEBUG)
+			DebugPrintUtil
+					.debugPrintln("jwatc\t" + (new Date()).getTime());
 
 		pageData = new PageData();
 		mapData = new VisualizeMapDataImpl();
 
 		VisualizeMapUtil.createNode2NodeMap(document, result, mapData);
-		
-		DebugPrintUtil.devOrDebugPrintln("create node2node map\t" + (new Date()).getTime());
+
+		if (DEBUG)
+			DebugPrintUtil.debugPrintln("create node2node map\t"
+					+ (new Date()).getTime());
 
 	}
 
@@ -204,45 +214,53 @@
 			problems = new Vector<IProblemItem>();
 			allPc = jwatc.getPacketCollection();
 
-			DebugPrintUtil.devOrDebugPrintln("packet collection\t" + (new Date()).getTime());
-			
+			DebugPrintUtil.debugPrintln("packet collection\t"
+					+ (new Date()).getTime());
+
 			cleanupPacketCollection(allPc);
 
-			DebugPrintUtil.devOrDebugPrintln("cleanup packet collection\t" + (new Date()).getTime());
+			DebugPrintUtil.debugPrintln("cleanup packet collection\t"
+					+ (new Date()).getTime());
 
 			ParamBlind curParamBlind = ParamBlind.getInstance();
 
 			// get packet and create map and list
 			NodeInfoCreator nodeInfoCreator = new NodeInfoCreator(mapData,
 					textChecker, problems, invisibleIdSet, curParamBlind);
-			
-			DebugPrintUtil.devOrDebugPrintln("Nodeinfo init\t" + (new Date()).getTime());
+
+			DebugPrintUtil.debugPrintln("Nodeinfo init\t"
+					+ (new Date()).getTime());
 
 			nodeInfoCreator.prepareNodeInfo(allPc);
-			
-			DebugPrintUtil.devOrDebugPrintln("Nodeinfo prep\t" + (new Date()).getTime());
+
+			DebugPrintUtil.debugPrintln("Nodeinfo prep\t"
+					+ (new Date()).getTime());
 
 			nodeInfoCreator.createAdditionalNodeInfo(result);
-			
-			DebugPrintUtil.devOrDebugPrintln("Nodeinfo additional\t" + (new Date()).getTime());
+
+			DebugPrintUtil.debugPrintln("Nodeinfo additional\t"
+					+ (new Date()).getTime());
 
 			// link analysis preparation
 			LinkAnalyzer linkAnalyzer = new LinkAnalyzer(result, allPc,
 					mapData, problems, invisibleIdSet, curParamBlind, pageData);
 
-			DebugPrintUtil.devOrDebugPrintln("link analyzer\t" + (new Date()).getTime());
+			DebugPrintUtil.debugPrintln("link analyzer\t"
+					+ (new Date()).getTime());
 
 			styleInfo = new VisualizeStyleInfo(orig, mapData);
 
-			DebugPrintUtil.devOrDebugPrintln("style info\t" + (new Date()).getTime());
+			DebugPrintUtil.debugPrintln("style info\t"
+					+ (new Date()).getTime());
 
 			/*
 			 * rewrite DOM from here
 			 */
 			// insert ID attributes to elements
 			mapData.makeIdMapping(Html2ViewMapData.ACTF_ID);
-			
-			DebugPrintUtil.devOrDebugPrintln("id mapping\t" + (new Date()).getTime());
+
+			DebugPrintUtil.debugPrintln("id mapping\t"
+					+ (new Date()).getTime());
 
 			styleInfo.setImportedCssSet(DocumentCleaner.removeCSS(result,
 					targetUrl));
@@ -261,21 +279,24 @@
 					mapData, curParamBlind);
 			colorUtil.setColorAll();
 
-			DebugPrintUtil.devOrDebugPrintln("color\t" + (new Date()).getTime());
-			
+			DebugPrintUtil
+					.debugPrintln("color\t" + (new Date()).getTime());
+
 			calMaxTime();
 
-			DebugPrintUtil.devOrDebugPrintln("max time\t" + (new Date()).getTime());
-			
+			DebugPrintUtil.debugPrintln("max time\t"
+					+ (new Date()).getTime());
+
 			problems.addAll(linkAnalyzer.skipLinkCheck(iMaxTime, iMaxTimeLeaf));
 
-			DebugPrintUtil.devOrDebugPrintln("skiplink check\t" + (new Date()).getTime());
+			DebugPrintUtil.debugPrintln("skiplink check\t"
+					+ (new Date()).getTime());
 
 			replaceImgAndCheck(result, mapData, curParamBlind.oReplaceImage);
 
-			DebugPrintUtil.devOrDebugPrintln("image check\t" + (new Date()).getTime());
+			DebugPrintUtil.debugPrintln("image check\t"
+					+ (new Date()).getTime());
 
-			
 			int errorCount = 0;
 			int missing = 0;
 			int wrong = 0;
@@ -320,8 +341,9 @@
 			VisualizeViewUtil
 					.visualizeError(result, problems, mapData, baseUrl);
 
-			DebugPrintUtil.devOrDebugPrintln("error visualization\t" + (new Date()).getTime());
-			
+			DebugPrintUtil.debugPrintln("error visualization\t"
+					+ (new Date()).getTime());
+
 			DocumentCleaner.removeJavaScript(mapData.getNodeInfoList(), result);
 			DocumentCleaner.removeMeta(result);
 			DocumentCleaner.removeObject(result);
@@ -330,11 +352,13 @@
 			DocumentCleaner.removeBase(result);
 			DocumentCleaner.removePI(result);
 
-			DebugPrintUtil.devOrDebugPrintln("document cleaner\t" + (new Date()).getTime());
-			
+			DebugPrintUtil.debugPrintln("document cleaner\t"
+					+ (new Date()).getTime());
+
 			VisualizationResultCleaner.clean(result, targetUrl);
-			
-			DebugPrintUtil.devOrDebugPrintln("result cleaner\t" + (new Date()).getTime());
+
+			DebugPrintUtil.debugPrintln("result cleaner\t"
+					+ (new Date()).getTime());
 
 			// TODO merge with visualizeError
 			Id2LineViaActfId id2line = null;
@@ -343,8 +367,9 @@
 						html2viewMapV);
 			}
 
-			DebugPrintUtil.devOrDebugPrintln("id2line\t" + (new Date()).getTime());
-			
+			DebugPrintUtil.debugPrintln("id2line\t"
+					+ (new Date()).getTime());
+
 			for (IProblemItem i : problems) {
 				BlindProblem tmpBP = (BlindProblem) i;
 				tmpBP.prepareHighlight();