diff --git a/example/Vulkan/OffscreenRender.cpp b/example/Vulkan/OffscreenRender.cpp
index 026c86ec..7a5a3a70 100644
--- a/example/Vulkan/OffscreenRender.cpp
+++ b/example/Vulkan/OffscreenRender.cpp
@@ -4,7 +4,7 @@
 using namespace hgl;
 using namespace hgl::graph;
 
-constexpr uint OFFSCREEN_SIZE   =512;
+constexpr uint OFFSCREEN_SIZE   =64;
 constexpr uint SCREEN_WIDTH     =1024;
 constexpr uint SCREEN_HEIGHT    =(SCREEN_WIDTH/16)*9;