You also have to have a video card that kicks ass.
I have the NVidia Quadro FX 5600 with 1.5 gb GPU and use this Premiere Plug In:
http://www.nvidia.com/object/IO_62559.html
It's the Elemental Accelerator from NVidia that shifts the processing for encoding, decoding, filters, effects, etc. and the actual rendering to the GPU of the vid card instead of your computers CPU which is SMOKING fast.
Check out this video and you'll see it work:
https://youtube.com/watch?v=yGLKY...eature=related
Then check out this one and you'll understand how your video card and GPU can make all the difference:
https://youtube.com/watch?v=JOwDuW6I1p4