If you mean "smart rendering" like videoredo does (i.e. pass through of untouched segments & cuts editing - only transitions, effects need rendering) , then you need the mainconcept premiere plugin (it's separate) For import you an use avs import plugin (works in CS4 and below, buggy for CS5) , but as soon as you use avisynth, everything is uncompressed, so you need rendering anyway (i.e. no smart rendering or direct stream copy - same as in vdub when you use avisynth)