I have a Blueberry clamshell that I recently installed Tiger on using XPostFacto. It's slow, but not unbearable. Although I wonder if the OS performance is affected by the fact that it runs with XPostFacto. I remember reading somewhere about how Tiger runs very well on older Macs, especially if they're not running any hacks. (I might have read it here, but I can't seem to find a corresponding thread) Anyway, after installation with xpf, does OS X run on an unsupported machine like it would on a supported one? Or does the hack have to run in the background every time? Are there any performance issues? Before anyone asks, my clamshell is 300 MHz non-Firewire, with the ram maxed out at 576 MB. Spotlight and Dashboard are disabled, extra languages and architectures removed with Monolingual, and I usually run ShadowKiller on startup. Could I speed things up even more if I could somehow get Tiger installed normally and not with a hack?