I've noticed several people with Safari issues. I'm new to mac and love safari, but when I'm downloading anything more the 500 MB on limewire, safari AND firefox grind to a halt. Any other time, the mac is snappy and responsive, but not while DL on limewire. It's a brand new 13" 2.53 ghz uMBP, i thought that multitasking wouldn't be an issue whatsoever On windows you could set a bandwidth allocation for things like limewire downloads, but I haven't noticed that on the mac. Still exploring though.