My problem is similar to the one described at http://devnet.jetbrains.com/message/5299711 , but I am not sure the suspected cause is the same--removing old virtual environments don't seem to affect performance.
Anyway, all is good except that for most of the 1.5 EAP downloads, and the 1.5.x releases, code completion really seems to slow down the editor. I didn't seem to have this issue with the previous release (1.1?).
Is anyone else experiencing this issue? Are there any "easy" fixes to try, like removing some cruft from the configuration directory or something?