The most I've done on the iBook 600 (384 MB ram) is 12 tracks with about 8 plugins (two or three verbs, 4 EQ, 2 compressor - i'm sort of dredging this up from memory, but that's the basic idea), and it is still running at about 50% CPU usage. Looks like I'm a long way from hitting the wall. Works great for me. I've allocated about 100MB to DAE and PTLE, and run only on essential extensions. I haven't heard about this "update" - anyone else have word on this? dc