QuartzGL
QuartzGL (called Quartz 2D Extreme when it was introduced in Mac OS X Tiger) is GPU acceleration for the Quartz 2D API. As of Mac OS X Snow Leopard, it is still not enabled by default. However, it has been possible to enable it, using the Quartz Debug application included in the Apple Developer Tools. QuartzGL will be disabled once again upon quitting the Quartz Debug utility. A workaround is to force quit the Quartz Debug application, which will leave QuartzGL enabled system-wide.
All graphics cards capable of supporting Core Image also support QuartzGL.
As of August 2011, no non Apple web browser fully support GPU hardware acceleration based QuartzGL for rendering contents. Firefox 13.0 and later supports hardware acceleration on OSX 10.8/10.7/10.6. Mac OS X 10.7, however, includes an edition of the Safari browser with full hardware acceleration support.
Read more about this topic: Quartz Compositor