Issue title: Window Mode works! FullScreen Lagging.
 Issue body: I use Moonlight in Window Mode on Chrome and everything works great. If I switch to FullScreen image laggs and mouse movements lags and everything feels fine shifted by 500 ms. In window Mode it feels not delayed.

Streamer and Client both uses 720p Resolution. 1388x720 with 60fps. Connected with LAN 1 GBit both Computers. Direct connection with only one switch.

Can someone give me an hint why FullScreen don't work very well?
 Comments: 
 Comment 0: @Floraly You are using a very weird resolution, maybe the scaling that (maybe) happens in fullscreen is at the heart of the problem
 Comment 1: This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

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