Hmm. First I would suggest backing up everything and doing a full wipe, then checking to be sure the .android/secure folder on your sd card has been wiped. Especially if you've been flashing a lot of roms, things can really slow down if you haven't wiped in awhile. I would also suggest making a full backup of your sd card, reformatting it, then restoring your backup.
However, I too have noticed poorer cpu performance in the last few days, and I have no idea why. I've been on the 2.3.4 leak with Gummy for awhile now, since the first alpha I got in irc. I don't put much stock in benchmarks, but still my Quadrant was anywhere from the high 1100's to the high 1400's, mostly mid 1300's, with a high of 1481. This is of course on a stock GB kernel with RFS filesystem, so I was pretty impressed. Suddenly I can't get much over 1000, even after a full wipe and re-Odinflashing everything. Whether stock or after I restore my files. Phone does seem to be a bit slower with certain things, and other benchmarks suggest reduced cpu performance as well.
I don't know what's going on, or why I can't figure it out, but I don't like it. I really hope it isn't a hardware issue, as my Charge has worked very well since I got it. Not to mention the hassle involved to prove to VZW they should give me a new one, and hoping I don't get a refurb. I'll keep looking, hoping this is just some rogue app that will be updated in a few days and I'll be good again.