diff --git a/src/examples/Stress.cpp b/src/examples/Stress.cpp
index 5d9eadf3..4019b05a 100644
--- a/src/examples/Stress.cpp
+++ b/src/examples/Stress.cpp
@@ -8,6 +8,7 @@
 #define NUM_PER_LINE 16
 #define SIZE 50
 
+static bool rendered = false;
 static int count = 0;
 static int frame = 0;
 static std::vector<tvg::Picture*> pictures;
@@ -108,10 +109,14 @@ void drawSwView(void* data, Eo* obj)
 
     t4 = ecore_time_get();
     printf("[%5d]: total[%fs] update[%fs], render[%fs]\n", ++frame, t4 - t1, t2 - t1, t4 - t3);
+
+    rendered = true;
 }
 
 void transitSwCb(Elm_Transit_Effect *effect, Elm_Transit* transit, double progress)
 {
+    if (!rendered) return;
+
     t1 = ecore_time_get();
 
     for (auto picture : pictures) {
@@ -124,7 +129,9 @@ void transitSwCb(Elm_Transit_Effect *effect, Elm_Transit* transit, double progre
     //Update Efl Canvas
     auto img = (Eo*) effect;
     evas_object_image_pixels_dirty_set(img, EINA_TRUE);
-    evas_object_image_data_update_add(img, 0, 0, WIDTH, HEIGHT);    
+    evas_object_image_data_update_add(img, 0, 0, WIDTH, HEIGHT);
+
+    rendered = false;
 }
 
 
diff --git a/src/lib/sw_engine/tvgSwCommon.h b/src/lib/sw_engine/tvgSwCommon.h
index 47a69154..0bcd5d35 100644
--- a/src/lib/sw_engine/tvgSwCommon.h
+++ b/src/lib/sw_engine/tvgSwCommon.h
@@ -270,6 +270,7 @@ SwFixed mathMean(SwFixed angle1, SwFixed angle2);
 void shapeReset(SwShape* shape);
 bool shapeGenOutline(SwShape* shape, const Shape* sdata, const Matrix* transform);
 bool shapePrepare(SwShape* shape, const Shape* sdata, const SwSize& clip, const Matrix* transform);
+bool shapePrepared(SwShape* shape);
 bool shapeGenRle(SwShape* shape, const Shape* sdata, const SwSize& clip, bool antiAlias, bool hasComposite);
 void shapeDelOutline(SwShape* shape);
 void shapeResetStroke(SwShape* shape, const Shape* sdata, const Matrix* transform);
diff --git a/src/lib/sw_engine/tvgSwRenderer.cpp b/src/lib/sw_engine/tvgSwRenderer.cpp
index 6b7cb0a7..3f94179f 100644
--- a/src/lib/sw_engine/tvgSwRenderer.cpp
+++ b/src/lib/sw_engine/tvgSwRenderer.cpp
@@ -49,13 +49,17 @@ struct SwTask : Task
 
         SwSize clip = {static_cast<SwCoord>(surface->w), static_cast<SwCoord>(surface->h)};
 
+        //Invisiable shape turned to visible by alpha.
+        auto prepareShape = false;
+        if (!shapePrepared(&shape) && (flags & RenderUpdateFlag::Color)) prepareShape = true;
+
         //Shape
-        if (flags & (RenderUpdateFlag::Path | RenderUpdateFlag::Transform)) {
-            shapeReset(&shape);
+        if (flags & (RenderUpdateFlag::Path | RenderUpdateFlag::Transform) || prepareShape) {
             uint8_t alpha = 0;
             sdata->fill(nullptr, nullptr, nullptr, &alpha);
             bool renderShape = (alpha > 0 || sdata->fill());
             if (renderShape || strokeAlpha) {
+                shapeReset(&shape);
                 if (!shapePrepare(&shape, sdata, clip, transform)) return;
                 if (renderShape) {
                     auto antiAlias = (strokeAlpha > 0 && strokeWidth >= 2) ? false : true;
@@ -209,12 +213,15 @@ void* SwRenderer::prepare(const Shape& sdata, void* data, const RenderTransform*
         if (!task) return nullptr;
     }
 
-    if (flags == RenderUpdateFlag::None || task->valid()) return task;
+    if (flags == RenderUpdateFlag::None) return task;
+
+    //Finish previous task if it has duplicated request.
+    if (task->valid()) task->get();
 
     task->sdata = &sdata;
 
     if (compList.size() > 0) {
-        //Gurantee composition targets get ready.
+        //Guarantee composition targets get ready.
         for (auto comp : compList)  static_cast<SwTask*>(comp.edata)->get();
         task->compList.assign(compList.begin(), compList.end());
     }
diff --git a/src/lib/sw_engine/tvgSwShape.cpp b/src/lib/sw_engine/tvgSwShape.cpp
index 49166ecf..68b5387b 100644
--- a/src/lib/sw_engine/tvgSwShape.cpp
+++ b/src/lib/sw_engine/tvgSwShape.cpp
@@ -459,6 +459,12 @@ bool shapePrepare(SwShape* shape, const Shape* sdata, const SwSize& clip, const
 }
 
 
+bool shapePrepared(SwShape* shape)
+{
+    return shape->rle ? true : false;
+}
+
+
 bool shapeGenRle(SwShape* shape, TVG_UNUSED const Shape* sdata, const SwSize& clip, bool antiAlias, bool hasComposite)
 {
     //FIXME: Should we draw it?