I just figured out something that might resolve the problem on this. My memory setting in Preference was set to "Optimize rendering for performance". I have just changed this to optimize for Memory. According to the F1 files, this should handle...Still testing.But if anyone else knows of something better to do, then let me know.
If that does not help, and it should to some degree, please take a look at this ARTICLE, as there might be some useful tips in it. If you have Win7, be sure to follow the link in Reply 4 to Black Viper's comments on optimization.
Also, take a look at this ARTICLE for some more comments on Resources/Memory.
Lately there have been some posts by people who had some difficulty with calculus, like 2 x 6 = 24, etc. and I hope you are not among them.
You say dual quad core, which in my opinion makes for 8 physical cores and you have 6 GB RAM. Intel suggests a minimum of 1 GB per core, so 8 GB would be the minimum recommendation. As you stated in your topic header, that is a likely candidate for your problems.