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Re:UI Performance Decline – OS X Tiger to Yosemite [video] by rdsubhas on Wednesday December 24, 2014 @03:48AM (#8792144)
Go to "System Preferences - Accessibility" and enable "Differentiate without Color" and "Reduce Transparency". Made a world of a difference to me, and I no longer think about Mountain Lion.
Re:UI Performance Decline – OS X Tiger to Yosemite [video] by doomlaser on Wednesday December 24, 2014 @05:30AM (#8792366)
Even "Reduce Transparency" has a nice big graphical glitch:

https://twitter.com/Doomlaser/status/538539277978972160

Yosemite breaks rounded rect corners in UI overlays, like the ones triggered by volume and brightness changes. The masking is broken when the translucent blur shaders aren't applied.

You'd think that'd something they would easily catch in QA before 10.10 shipped, but it's still broken even in 10.10.1.

Re:UI Performance Decline – OS X Tiger to Yosemite [video] by OxO4 on Wednesday December 24, 2014 @07:26AM (#8792590)
In OS X 10.10.2 (14C81h), this does not seem to be a problem anymore.
Re:UI Performance Decline – OS X Tiger to Yosemite [video] by 0942v8653 on Wednesday December 24, 2014 @11:28AM (#8793369)
Finally! I was sure they would never fix it. I'm actually considering downloading the beta now. Any other improvements?