8.0.2 (due out this month) is supposedly noticably better than 8.0.1, so that may help you quite a bit.
8.5 Beta 1 likely has most of 8.0.1's performance enhancements, but probably very little of 8.0.2's enhancements. Future betas will probably be better.
Regardless, 8.5 Gold should be faster than all the betas, since it would be the "latest and greatest" and also not have any of the Beta's debugging code running (which will definitely slow some things down).
If you've still got performance problems there's always the 8.x "Basic" mode (i.e. not Eclipse-based).
Feedback response number ECBS7HGP8J created by Erik C. Brooks on 08/13/2008