Hi Bill,
Firstly, thank you very much for taking the time to write such a detailed response. It’s very kind of you to go to such trouble.
I must say some of what you said has gone over my head, but I think I got the gist of it.
I guess the summary of what I wanted to know comes from the issue i come across when applying a filter to a sequence and then having to watch the Mac attempt to play the footage back smoothly (and fail). I understand from your post, that spreading the processor is not possible across multiple locally networked machines. So I assume my best chance of aiding this process (without spending too much money) is to do as other posters have suggested, and upgrade my Graphics card.
Thanks,
Ben