i'm jailbroken on an iphone 4 with tethered redsnow ios 5.0.1! For some strange reason my ISX has become extremely laggy! sometimes it even freezes up my phone for a few minutes! It just happened randomly, so i don't know if it's something that i have installed thats causing it to do this. If so, how can i troubleshoot it?
now that ISX is pretty solid i would venture to guess that it must be conflicting with another JB app/tweak of yours
i would start removing apps/tweak one by one, starting with the latest and working your way back to see if you can find the culprit. also, after you remove something i would respring in hopes it resets a bad configuration as well.. heck, maybe just a tethered boot might do the trick, its worth a try
pain in the ass i know, but this is what i have done and will continue to do if needed in situations exactly like this. let us know how it goes