Hi, Is there any way to improve the video performance on my iBook G3 (600mhz, 640MB RAM, 16MB VRAM)? I find that besides not being able to play any of the HD trailers at Apple's website (even 480p), it can't even seem to play a standard trailer without stutterring. Is there anything I can do to improve the video performance? Would downgrading from Tiger to Panther help? Thanks.