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Comment by conradev | Hacker News Reader

Even with "Reduce Transparency" enabled (blur disabled) I've had times when Mission Control operates at 2 frames per second on my 13" 2013 rMBP. This never happened using Mavericks.

If you try full screen zoom on Yosemite with an external display attached, it's similarly unusable.

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Yeah, regardless of transparency settings, WindowServer seems to get really slow after it's been running for awhile (days? hours? it depends.) Restarting the login session or doing a full reboot seems to fix it ... for a little while.

Performance goes downhill faster for me with an external display connected.

This. I love the full screen zoom but had to turn it off for my thunderbolt display. Also I had a hot corner for Mission Control that was similarly laggy, had to turn that off too :(

the zoom with a thunderbolt display attached is unbearable! I really hope they fix the jankiness

It's good to see this get some attention. I spent a long time trying to figure out how to make full screen zoom usable with an external display.

I found if you enable the "Increase Contrast" accessibility feature, performance is improved, but it does negatively affect aesthetics.

I answered my own question about this on Apple StackExchange here:

http://apple.stackexchange.com/a/157118/70049

This is one of the clear areas where performance is nowhere near previous versions. One solution is to switch to the "Picture-in-picture" zoom style under the Accessibility preferences.

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