As I see others still having the same problems I encountered, I will put in my 2 cents on this issue as well.
I tried the Beta a couple months ago, but found it unplayable due to performance issues [my system is similar to the above posters]. I was hoping this would have been fixed by now, and that I could try testing it again, but it looks like it has not been.
I would like to STRONGLY
encourage the developers to correct this issue ASAP
The #1 reason being, that if your beta testers cannot play the game, then we cant really help test it for you guys. This situation will lead to far less testing, and fixes prior to release, which can lead to big problems down the road. Performance issues reduce tester feedback.
Specific performance issues I had were the same as some of the other posters in this thread. One I would like to add is that even the in game help menus took forever to pop up, meaning I could not even just read about things in game without being frustrated to the point of logging out. Having at least the help menus working well would be...umm, helpful!