My N900 slows down after installing tweaker. I restart the device bt no effect. I uninstall two program.

1. Tweaker
2. The application that shows u the cpu and disk usage with 2 bars beside the battery icon(sorry i forget the name perhaps cpu load applet)

Now its working fine. Please tell me which one has the bug??

BTW then second caused me same problem already once. But I install it again and the problem appeared to be resolved

If you think its one of the two, then why don't you reinstall one at a time and see when the device slows down again?