you are correct when decribing my green bar problem, it takes away previously RAMed areas to RAM the next part. Thanks for phrasing it in a way that more people can understand!
And yes, my computer s quad core, i am going to try that multi core rendering that you said. Is there any drawbacks to using it? Also might just get nucleo pro 2, but it doesnt support cs4 yet.
Thanks for the response.