objective c - NSWindow setFrame very laggy -

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my application video window follows application window. i'm capturing screen, find location of other application , moves mine accordingly. have tracking thread capturing , tracking right position , if has been changed dispatches call updating position on main thread:

void tracingthread() {     while(true)     {         captureandtrack();         if(positionchanged)         {             dispatch_async(dispatch_get_main_queue(), ^{ setwindowpos(); });         }     } }  void setwindowpos() {     [window setframe:_newframe display:yes]; }

everything works fine except fact setframe laggy when dragging other app. guess because amount of events being dispatched. maybe there else. ideas how can improve performance?


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