Never seen flickerings of any kind in OS X Yosemite since DP4 or something. I did always notice the lag when clicking any perfpane and wait nearly a full second before it would load. This used to be instantly on OS X Mavericks and before. I experienced a similar lag in OS X Lion though. Since I installed the OS X Yosemite v10.10.3 beta (couldn't resist because of Photos) prefpanes load instantly again.Not from my end... I still see lags and flickerings...
I own a 2013 iMac equipped with a NVIDIA GeForce GTX 780M (4GB of memory) so maybe it depends on the drivers.
Anyway, I'm noticing a trend where the (Mac) OS X featuring the first revision of a new Aqua interface always suffers from a more noticeable lag in certain areas. This tends to be fixed in the successor or subsequent updates.
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