ewan- It shouldn't be that much slower, I assume you also have virtual memory turned on? If you do have it on, try turning it off, I've installed scanners on Macs that would scan 4 time faster with virtual memeory turned off. Other than that I'm at a loss. Incidently, years ago we did a school progect on our (even then) antique SG workstations, in Alias, rendertime was 1 frame per day at one stage!