[Yosemite DP 5] mac os app switching becomes sluggish due to prl_deskctl_agent

Starting with Yosemite DP 5, the app switching function (like switching by clicking a window or via command + tab) on Mac OS has become super sluggish. I'm referring to a Mac OS function, not Parallels.

All you need is to have Parallels installed, and try switching apps by clicking on a window. You get a noticeable hang (the OS being unresponsive for 5 - 6 seconds) before the desired app finally becoming active. It was traced to the Parallels' desktop control agent. In system.log I see

Code:

8/10/14 6:39:26.758 PM prl_deskctl_agent[218]: IMK Stall detected, *please Report* your user scenario in <rdar://problem/16792073> - (activateServerWithReply:) block performed very slowly (5.08 secs)
8/10/14 6:39:26.758 PM prl_deskctl_agent[218]: IMK Stall detected, *please Report* your user scenario in <rdar://problem/16792073> - (deactivateServerWithReply:) block performed very slowly (5.08 secs)

I am running the latest Parallels 9 (9.0.24237).

This happens most reliably (at least in my case) by clicking on a window. It often happens (but not always) if you do command + tab. It doesn't seem to happen if I click on the title area of a window.

And it seems like the only way to fix this is to uninstall Parallels.

Any thoughts?

 

Could you confirm if this is indeed an issue with the desktop control agent + yosemite? Any possible workaround for this problem?

 

Noting that this issue still exists with Parallels 10 and Yosemite DP 6.

Is there any workaround for this issue? It's real bad.

 

I was able to fix it by uninstalling Parallels Access (http://kb.parallels.com/en/117142).

 

Uninstalling Parallels Acces resolved the same issue for me on a 15" rMBP (2012). Thanks!

 

I can confirm that the same thing happened to me on a new 13" rMBP. Fixed by uninstalling Parallels Access.

 

The same problem happened to me on a MacBook Pro (15-inch, Early 2011) after installing Yosemite. I uninstalled Parallels Access and the problem and console messages went away.