I have found an interesting problem with plugins. Whenever I load plugins my frame rate immediately drops by 20 to 30 FPS. Unload them and the frame rates go back up to normal. I have a Radeon 6970 and can reproduce this on any of this years Catalyst versions including the pre-release 11.4 that is available.
Because of this I have had to stop using plugins all together.
Am I alone in this? Anyone else seeing it?