sbiddle: With those sorts of figures for CPU load you obviously don't have a video card doing hardware acceleration. This is something that is a virtual must for the H.264 streams.
I found channel changes on MP to be very quick.
So you are saying that even though I don't see more than 65% peaks of cpu load that a card with hardware acceleration will improve video performance, i.e get rid of the tv3 jerkiness?
How fast are the channel changes? We have the same tuner card HVR3000 and our cpus are about the same performance. What is making mine slow?