Funktionen är av per default och stöds endast av relativt nya grafikkort. Du kan slå på med hjälp av:
/Developer/Applications/Performance Tools/Quartz Debug.app
Läs mer (allt?) här:
http://arstechnica.com/reviews/os/macosx-10.4.ars/14
"There's one final barrier to hardware-accelerated bliss. Quartz 2D Extreme is disabled by default in Mac OS X 10.4.0. That's right, the whiz-bang new technology you just read all about is not actually used in Tiger unless it's explicitly enabled using the Quartz Debug application. Even then, it only applies to applications that are launched after it was turned on. It also appears that Q2DE is re-disabled when you quit the Quartz Debug application.
Why develop something as impressive as Quartz 2D Extreme and then leave it turned off by default? My inquiries to Apple have gone unanswered, so I can only speculate about the reasoning behind this decision. My best guess is that all of the bugs could not be excised from Q2DE in time for Tiger's launch date, and that it will be enabled by default in a subsequent update—perhaps as early as version 10.4.1."
