I just uninstalled SafariBlock after using it for a few months, only to finally determine that it was the cause of my computer drastically slowing down! I'm using a Powerbook G4 with Tiger. I am also using WebKit, so not exactly Safari, so I'm not sure if that affected it or how. My browser now runs about 1.5-2x faster after uninstalling. Before there were plenty of long beach ball pauses when opening new sites or switching between tabs.

Anyway, if anyone knows how I might be able to run SafariBlock without the slowdown (and without actually running the original Safari because WebKit is awesome) I would really appreciate it.