I am running Leo right now with m165 on my 8-core. I have 8 layers running DV at 30fps no vfx and no cfx. With each layer in loopfw, I am dropping frames in at least 2 layers. When I sync all to layer 1, I am dropping frames in 4 layers.
Granted I am using a 1920x1200 monitor as primary and a TH2G (in dual mode) running 2 - 1280x1024. However, the exact same monitor config on Tiger works with up to 11 layer before frame drops. (Not to mention the 14 layers I can get running 2 DH2G or a single and1 TH2G outputting 4 - 1280x1024
Leo basically Sucks!