I don’t believe it is limited to 64-bit OS either. I’m running 3.0.4 PI and am having trouble running a layer with any sort of background (ie an avi, png sequence, anything).
For example 2 layers, layer 1 = emitter, layer 2 = background sequence. 1920 * 1080 resolution.
Both layers visible = 1.6 fps
layer 1 visible = 30 fps
layer 2 visible = 1.6 fps
And yes I have the most up to date drivers and hardware accelerated.
System:
Vista Home Premium 32-bit
1TB HDD
GeForce 9800 GT 512mb
Intel Core 2 Quad 3.2Ghz