(It feels like walking in quicksand and finding you can't move like you could.) Also, I've been seeing console logs filled with repeated messages regarding invalid connections and dumps of mismatched trackpad gestures, sometimes with the nearly the same message filling an entire 4000 line console view. See my 2nd answer.Īfter upgrading to Yosemite I've also been getting extremely slow response in a number of different situations such as long pauses for Spotlight to return file matches, slow start up of applications especially after waking from Display Sleep, as well as other operations. The first few minutes of usage are comparatively smooth, but still not 100%. Other workarounds that have been suggested have had poor results: The same test with only the single screen is perfect. It feels like when zoom is activated (on multiple screens), it drops down to software rendering or something equally slow.

Then try doing the same thing zoomed in - it's unbearably slow. For example, go to and move your mouse over the image slider. Improved, but still not up to previous standards. It is also 'perfect' when mirroring is used.Įdit: Removed link to as it's too fragile under normal circumstances to be a useful reproduction.Īfter upgrading to Yosemite 10.10.1, the performance is Note that zoom performance is 'perfect' (read: acceptable) once the external monitor is disconnected. I have not been able to find any acceptable solution. This has been reported on the Apple discussion forums multiple times: one MacBook Pro (Retina, 15-inch, Early 2013)Īccording to other sources, this seems to affect all Mac hardware running Yosemite It takes a long time to 'recover' from a zoom by zooming back out. System becomes unusably slow while zoomed in (8-12fps, while still trying to 'catch up' on missed frames). Zoom is buttery smooth, everything renders at 60fps, no lag whatsoeverĪll display on both screens is delayed, including video playback, mouse movement and keystrokes/text entry. Zoom in using CTRL+(two finger gesture) - or OPT-CMD-= Ever since upgrading to Yosemite, the accessibility zoom feature is unusable when connected to an external monitor.Įnable Zoom in System Preferences - Accessibility.Ĭonnect an external monitor, not using mirroring (second desktop).

Macbook pro os x yosemite slow