I have a P4 2.8 processor, Radeon Mobile 9000 card, and I have a smooth playback most of the time, only one scene very very slightly jerky. Using Core AVC decoder and Media Player Clasic. CPU load goes from 50% - 100%, but mainly around 80%-90%.
I LOVE the tauntaun facial movements. It is a small thing, but makes all the difference. Tauntaun looks much more believable. And the HD resolution ... impressive, most impressive!