I have a single processor G5 (1.6) as an example. if i open two safari sites running a flash file.. the window thats selected will run perfectly . but if i select the other window and make that the active window the window i was just on. runs slower. the flash animation runs at like 1/3rd its normal speed.. im fairly confident this is do to thread priority. since im no longer actively using that window it runs slowly now does this also happen on a dualie or will two windows have equal thread priority. since each processor can handel one of them.. im just curious. hope im being clear.