Test for someone with m295x, need to compare my m290x

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so picked base model imac retina. silky smooth until hooked other 1440p monitor up. mission control pretty laggy. remove 1440p , perfect again.

see test out on upgraded video card. use mission control bunch willing return computer , order upgraded 1 if going laggy.

uploaded video of , without monitor plugged in:

http://youtu.be/s96d3z2jwqg

wasn't laggy gets in video, shows mean.

edit: way test if have m295x, no 1440p monitor, open bunch of windows , crank scaling way top. if on 290x without external display hooked can laggy well.
 

i can't imagine upgrade fix kind of lag. looks more software issue (nothing can fix, apple can fix).
 


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