I've started to really work on build 3235 this week. The same time my laptop broke down (not your fault:) and I had to switch computer to a desktop 1.7Ghz/1GB Ram machine.
I've noticed that everything was kind of slow, edition, compilation, dialogs etc so I figured out that the new PC was slow. Anyway I tested 4.5.4 on the same machine with the same project and I think I got a 200% boots in performance, again IDEA was snappy.
I known that this is a EAP, but I really hope that you do some CPU profiling while working towards 5.0