diff --git a/vncviewer/Viewport.h b/vncviewer/Viewport.h
index 19b95a3..0b3a6c7 100644
--- a/vncviewer/Viewport.h
+++ b/vncviewer/Viewport.h
@@ -103,7 +103,7 @@
   void damageRect(const rfb::Rect& r) {
     damage.assign_union(rfb::Region(r));
     if (!Fl::has_timeout(handleUpdateTimeout, this))
-      Fl::add_timeout(0.100, handleUpdateTimeout, this);
+      Fl::add_timeout(0.500, handleUpdateTimeout, this);
   };
 
   static void handleUpdateTimeout(void *data);