After receiving the JB update via OTA I'm having the same issues. Everything is laggy and battery performance is really bad. Also, I read some reports of people getting stuck with the bugdroid animation after resetting the phone. I'm in Brazil and my carrier is Vivo.Still no matter what you're doing just havin the screen on for that long will tax your battery. I'm still out on the battery life on this phone. My HTC One X has a much smaller battery but lasts about the same (1800mAh vs 2530mAh).