I'm having this issue since forever, I think I read all the possible threads there are about this and still haven't managed to find a fix. Didn't really care about it until now because I didn't really notice it since I don't really game anymore, but now I really need to use Parallels daily and I'm forced to reboot several times a day because of this.
I'm also making my own thread because in all the threads I read no one with this problem had my graphics card, so ... maybe I'll get lucky
So, the problem goes like this: the Mac behaves properly until I put it in sleep. After wake graphic performance becomes really low: Games run like crap, I can't run Parallels because I can grow a beard till the graphics load, even Misson Control animations are choppy. I tried:
- the changing resolutions method: change resolution to anything else, then back to "best for built-in display" to 'reset' the graphics, but as far as I understand this, it doesn't even work because the resolution is scaled.
- creating a custom switchResX resolution, non-scaled. Did not work, screen went blank although it was a 1280x1024 one, which the display supports.
- resseting SMC and PRAM
- deleting power management, autoWake and systemui plists
- disconnecting everything except the keyboard
- turning the AirPort off before sleep
- everything above on 1) a different, barely created account, 2) a different, existing account, 3) the root account
- logging out and back in
- I even tried the Multibeast solution for hackintoshes that patches a smbios plist. (yea, I'm that desperate and don't even know what it does, so I tried it anyway)
- Tested with Cinebench before and after sleep and indeed, before sleep I get ~28fps, after sleep I get ~15-17fps.
- I don't have any temperature problems, everything is cool and the fans are running at min.
The only real "fix" for this is a reboot.
Running the Mid 2011 iMac, 3.4GHz i7 with the 2GB 6970M, 16GB of RAM.
Anyone has any other ideas, or had luck with anything else?