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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

Nov 11, 2014 1:26 AM in response to Predominant

Same issue here using the following:


Model Name: MacBook Pro

Model Identifier: MacBookPro11,3

Processor Name: Intel Core i7

Processor Speed: 2.3 GHz

Number of Processors: 1

Total Number of Cores: 4

L2 Cache (per Core): 256 KB

L3 Cache: 6 MB

Memory: 16 GB

Boot ROM Version: MBP112.0138.B11


--- V poor on Apple's behalf, my machine is hardly old and has plenty of processing power.

Nov 11, 2014 9:31 PM in response to Predominant

Add me to the list with this annoyingly slow zoom on my 2009 MacPro. I also have an issue where the screen looks like a mosaic when you grab a window and move it rapidly. I even tried updating the drivers for my Nvidia GeForce GT150 video card as Google search turned up a link to the Nvidia website that said it was needed for Yosemite and CUDA (I have never had to load OEM drivers for OS X before). After installing the driver and rebooting my Mac it seemed to fix the problem, but about an hour later the slowness was back.

Nov 12, 2014 5:23 AM in response to Predominant

i have it occuring here too

MBPr 650m


Zooming reduces overall fps to about 5fps

It's a little sporadic, but never gets better than maybe 10fps, and never gets noticeably worse than 5fps


Issue appeared after upgrading to Yosemite


Tested on another MBPr with 750m and can't recreate the issue (still smooth when zooming)

(note 750m and 650m are very similar, both 384 CUDA cores, just a bump in clock speed)

But we have different things installed.


Restarting tends to increase overall performance so haven't found it to specifically address this issue.


Haven't reported to Apple.

Nov 14, 2014 3:08 AM in response to Predominant

I guess the WindowServer Task is responsible for the performance issues. To improve responsiveness I deactivated the new transparency feature (Accessibility > Display > Less transparency). I also read about problems with third party system tools. Especially virus, cleaning, memory or tuning apps. Mac OS X does not need apps like this. Don´t install them at all.

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

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