Do you have a dual core CPU? If so, then the video encoding program may only be using one of the cores, and so F@H uses the other?
What F@H client(s) are you using?
yeah it's dual core... F@H can only use 1 core so it shows up as 50% in task manager. but it just seems like sometimes F@H is using up 50% even when there are higher priority processes, cause those processes seem to max out at 50%.
i was watching my video encoding yesterday. sometimes virtualdub would be able to get 100% cpu, but some other processes seem to max out at 50% all the time, as if F@H wouldn't throttle down...