Was running stock, now running GummyCharged 2.1. No apps installed in either rom fresh from factory resets and the phone lags to high holy hell, just like my Droid Incredible.
The Galaxy Nexus I'm getting to replace this piece of garbage is the last chance I'm giving Android before jumping ship to another phone I already hate with the bright flashy Apple on the back.
I recently flashed Humble 5.0 (built off of android 2.3.6) and it is doing phenomenal. No force closes, no reboots, no issues at all. I went 20 hours without charging my phone yesterday and that was with moderate/heavy use.
I personally don't like gummycharged too much even though thats what I'm currently running. The best set up I've ran so far is ImNuts Infinity Rom overtop of iMoseyon's lastest version (4.0.1?) voodoo kernal with a couple tweeks applied (loopy smoothness, v6 supercharge, 3g turbo charge, fuju tweeks)