Reflash your phone/remove junk thoroughly and kill all that lubbing (leave OC kernel though). My n900 was running slow after I fooled with extras-devel apps. Now I'm more carefull. No glitches, everything is silky smooth. works better than Vibrant that i used to have.

UI on first androids sucked big time. Was slow and glitchy. I had G1... what a nightmare that was.