Hi, Really cool image. I also suffered serious slowdown problems last week. What seemed to fix my problem was creating an extension set just for carrara with the minimum number of extensions needed to run it. I also use a mac, though a G3 powerbook (the pismo) not an imac. My problem may have been a little different though, because my computer would slow down the longer carrara was running, even if I was working on something very simple. Turning off most of the eyecandy in the preferences also helped, but it was the extension thing that really put an end to the problem (for now anyway, knock on wood). Cheers, Max