I've been told that my woes may be about large window server display buffers and to try 10.10.2 beta. Giving it a shot…
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10.10.2 was a nightmare for my rMBP.. had to rollback to to 10.10.1…
Lots of graphics issues btw
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Check you don't have old display kext on your system (like AirParrot - APXXX.kext). They were the culprit for me
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