Testing v2 beta on OS 10.4.7 PPC (iBook G4 1GHz), seems ok but it looks slower than 1.x when browsing pictures: I usually drag a photo folder on the application icon and then browse through photos one at a time, and with v2 very often I see a black area at the bottom of the screen immediately after advancing to the next photo, which is then filled up with the corresponding photo part; looks as if the photo still has to be completely drawn (or loaded?) when I'm already viewing it.
This didn't happen with v1.x. I tried deactivating antialiasing but it made no difference.