I use C1 in sessions with a 13" 3.0 i7. Runs fine. In the develop module its comparable to Lightroom (use for DAM and non-XTrans edits) or Aperture (used to use). I have no doubt that throwing a discrete GPU at it might speed things up, but that's like saying a Mac Pro would speed things up. It's what you are satisfied with. For me, Iris is fine.