I use Safari in fullscreen, and sometimes is has a VERY unsmooth transition to the desktop when I swipe. I notice _windowserver spikes in Activity Monitor when I swipe between the two screens. If I swipe from my mail, to safari, then to my desktop _windowserver spikes up to 50% CPU usage. Typically it idles at .6%, and most of the time it does not spike that high and I have a very smooth transition between screens.
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