It will be interesting to compare performances of GUI on different macs using Let1kWindowsBloom. It's a cool little app that shows in how much time your mac can open and close 1000 windows,you can download it here . It's only few kB's big.. It will be interesting to see how much does QE improve performance. Ok,this is my system: iMac G3 350 MHz/320MB RAM running 6D42 with no other apps open,dock hidden,animated app launching off.. with shadows=102 seconds no shadows=97 seconds CPU load 100% all the time of course. Those of you with QE supported machines please note how big was CPU load while Let1kWindowsBloom is popping windows.