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Zoom (Accessibility feature) is extremely slow with multiple monitors [OSX 10.10]

When connecting an external display to my Laptop and using the "Ctrl + Scroll" functionality for accessibility zooming, the display/graphics are extremely slow.

An estimate of FPS would be sub 1FPS. The machine becomes unresponsive and is unusable for a minute or so, until I can get it zoomed back out, and it begins responding normally.


This is very disruptive, as its a feature I use often.

The same laptop on OSX 10.9 did not exhibit this issue.


Hardware: MacBook Pro 13" Retina Mid 2014, 16GB Ram

Software: OSX Yosemite 10.10

System Information: http://cl.ly/image/0H1p032w0M0w


Reproduction steps:


1. Enable CTRL+SCROLL zoom functionality in System Preferences > Accessibility

2. Connect external monitor (Display port cable)

3. Hold CTRL and Scroll to zoom

4. System becomes slow, graphics slow, showing < 1 FPS without any other applications running

MacBook Pro with Retina display, OS X Yosemite (10.10)

Posted on Oct 23, 2014 6:33 PM

Reply
72 replies

Oct 24, 2014 12:44 PM in response to Predominant

I also have the same exact problem. I have a i5 iMac Mid 2011 with an upgrade to 10.10 Yosemite connected to an external display. I like you never had this issue with Mavericks. Zoom is so painfully slow now that I had to disable it. My iMac has 12 GB of RAM and even with no apps opened, zoom is killer slow.. makes me want to punch a wall-kinda slow.


I think it's clear to say that something is up with 10.10.. some bug.


Apple please fix us zoomers 🙂

Oct 29, 2014 2:09 AM in response to Predominant

Just to note, I have the same problem....


When you use Thunderbolt display with 15" MB Pro late 2013, it zooms unreasonably slow.

But when you close the laptop display and only have the Thunderbolt display on, it zooms a bit faster, but still too slow for such a new laptop.



I think it could be optimised a bit better, something somewhere can be improved here.



Regards,

Ned

Oct 29, 2014 11:15 AM in response to Predominant

Did you guys try to disconnect the external monitor and see if the zoom behaves normally again? It works fine if I disconnect the external monitors attached to my Thunderbolt port.


So there's some relation between both...


It seem to be also affecting the Mission Control response as well. Not as bad as the zoom but there is some degradation in performance.


Wonder how long Apple will take to address this.

Zoom (Accessibility feature) is extremely slow with multiple monitors [OSX 10.10]

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