This guide will help you enable/disable QuartzGL and BeamSync on Leopard!
sudo defaults write /Library/Preferences/com.apple.windowserver QuartzGLEnabled -boolean YES
Change YES to NO to disable it.
Restart or Log Out to take effect.
sudo defaults write /Library/Preferences/com.apple.windowserver Compositor -dict deferredUpdates 0
Change 0 to 1 to enable it
You can also edit the file /Library/Preferences/com.apple.windowserver.plist using PlistEdit Pro or Property List editor from Xcode.
That should take care of it..
TPC Hackintosh Users Group
Posted by Sharedplayer on http://forum.insanelymac.com/index.php?showtopic=64656
Quote dari bishopdante
I’m hardly an Apple in-house systems engineer, I’m a user, but from what I understand from my reading, it works something like this.
QuartzGL may not be so optimised at the moment. Your Graphics card may be not so hot. CPUs are really fast when munching up screen-res sized images. It may also be that the apps aren’t optimised for QuartzGL either, and is having to effectively run the old code as well in order to translate into suitable Hardware Accelerated form. It may also be all of the above co-operating to make it sluggish.
QuartzGL is not exactly off either. It’s off by default. Applications which are compatible with it switch it on, and use it happily.
Basically the data flow is that QuartzGL or Quartz non-GL (CPU flavour) feed into a natively OpenGL Compositing element of OSX. This whole process is called Core Image. Were you to do Quartz non-GL > QuartzGL > OpenGL Composite, then obviously this is less efficient.
Chances are that when we get OpenCL in Snow Leopard, then all of the tasks can be passed to the GPU indiscriminately, and the card will just munch them raw, regardless of what you want.
When you activate QuartzGL by default, all apps start using QuartzGL, not just the right apps.
The bottom line: the software which uses it dynamically will run at the same speed. The software which predates the option to switch it on isn’t written for it, and won’t work any faster. In actual fact, it’ll run slower. The CPU is having to do just the same work as before, running just the same code as before.
I don’t know which version of Xbench you’re using. Chances are it’s for testing current Macs, so the performance will obviously deteriorate when you switch on QuartzGL by default.