Created attachment 551392 [details] Sampling file from Activity Monitor I normally run up to 5 tabs per window and up to 3 windows. Camino 2.0.7 on a PPC G5 running Leopard 10.5.8 slows down until it is practically unusable. Sometimes a spinning beachball shows up. More often it doesn't. However, clicking on any window takes forever for Camino to respond. Ditto for clicking any hyperlink on any window. CPU then hikes up to 90% or thereabouts but I can still switch to other apps which then run pretty quickly. The same windows with the same number of tabs when opened in Safari 5.0.6 on the same hardware and OS run pretty fast. Sampling the process shows that Camino seems to bog down with lots of semaphore_wait states. I enclose a sampling file of Camino when it enters this state.
FYI for future bug filing: flags are reserved for Camino developer use; do not set flags on bugs. This is the same as bug 412223 (_enableOrDisableTrackingAreas / _disableTrackingArea); we never figured out what was causing it, but with with an up to date version of Flash we stopped seeing it, so you should check your Flash version. If that doesn't help, I'd suggest Camino 2.1b1, where nobody ever saw this.