Yeah, I tried it last night on a 300 X 400 test image. It skipped the IDL precalc alright but the subsurface took forever. Something more than an hour and a half later it was almost finished rendering. It was just insane.

"A lonely climber walks a tightrope to where dreams are born and never die!" - Billy Thorpe, song: Edge of Madness, album: East of Eden's Gate

Weapons of choice:

Poser Pro 2012, SR2, Paintshop Pro 8