I ran with Xperl unit frames for a bit, then moved to Pitbull. I installed Xperl last night and tweaked it a bit. I wasn't in the mood to mess with it too much as I was too busy being angry about my smashed Macbook Pro.
I turned off the party display while in a raid - I think that was also crushing my DPS with the raid since I had Pitbull showing spell casts, heals, and everything else. It was like tailing 24 log files - wonderfully fascinating, but I think crushing the system.
Right now I am getting ~40 to 46 FPS in Shattrath. I'll have to see how it looks elsewhere.