--- vistaFace.js.orig	2007-09-05 12:11:28 +0900
+++ vistaFace.js	2008-03-27 12:00:00 +0900
@@ -18,7 +18,16 @@
     
     this.isPowerLineStatusChanged = false;
     this.isWirelessStatusChanged = false;
-    
+
+    // cache settings
+    this._cache = {
+        faceChanged : true,
+        cpuUsageIndex : -1,
+        memUsageIndex : -1,
+        marker1 : -1,
+        marker2 : -1
+    };
+
     // default settings
     this.settings = {
           timerInterval : 1000
@@ -167,6 +176,7 @@
     , loadFaceDef : function (name) {
         this.debugPrint("loadFaceDef: "+name);
         this.faceDefDir = name;
+        this._cache.faceChanged = true;
         return this.loadFaceDefPlist(name);
     }
     
@@ -191,18 +201,34 @@
     }
     
     , switchPattern : function (cpuUsageIndex, memUsageIndex, marker1, marker2) {
+        // compare cache
+        if (this._cache.cpuUsageIndex == cpuUsageIndex &&
+            this._cache.memUsageIndex == memUsageIndex &&
+            this._cache.marker1 == marker1 &&
+            this._cache.marker2 == marker2)
+        {
+            return;
+        }
+
+        // save cache
+        this._cache.cpuUsageIndex = cpuUsageIndex;
+        this._cache.memUsageIndex = memUsageIndex;
+        this._cache.marker1 = marker1;
+        this._cache.marker2 = marker2;
+
         this.partsBackground.removeObjects();
-        
+
         for (var i = 0, n = this.currentFace.pattern[memUsageIndex][cpuUsageIndex].length; i < n; i++) {
             var partNum = this.currentFace.pattern[memUsageIndex][cpuUsageIndex][i];
             var part = this.currentFace.parts[partNum];
-            if (i == 0) {
+            if (i != 0) {
+                this.addPart(part);
+            } else if (this._cache.faceChanged) {
+                this._cache.faceChanged = false;
                 this.partsBackground.src = this.faceDefDir + "\\" + part.filename;
                 this.partsBackground.style.position = "absolute";
                 this.partsBackground.style.top = part['pos y']+"px";
                 this.partsBackground.style.left = part['pos x']+"px";
-            } else {
-                this.addPart(part);
             }
         }
         if (marker1) {
@@ -321,6 +347,7 @@
         
         var cpuUsage = this.faceCPUIndexUsageProc();
         var memUsage = this.faceMemIndexUsageProc();
+        if (DEBUG) {  // heavy load
         this.debugPrint((this.isPowerLineStatusChanged ? "!1," : "") +
                 (this.isSignalStrengthChanged ? "!2," : "") + 
                 (System.Machine.PowerStatus.isPowerLineConnected ? "AC," : "") + 
@@ -333,7 +360,7 @@
                 ",S[C]:" + this.settings.cpuUsage +
                 ",S[M]:" + this.settings.memUsage +
             "");
-        
+        }
         this.switchPattern(
              this.getFaceCPUIndexByUsage(cpuUsage) // cpu
             ,this.getFaceMemIndexByUsage(memUsage) // mem