After updating AOKP to the latest build 3, my phone started to get really laggy. Digging around in Google I found others having the same problem. It seems that the SystemUI has a memory leak, and starts consuming an abnormal quantity of RAM. This means that apps will start to be killed and relaunched, including the UI. The consequence is the sluggishness of the phone. Rebooting solves the problem, but it’s only temporary.
AOKP build 3 is out, and after showing how to install AOKP from scratch, this is how I usually upgrade a ROM in my Galaxy Nexus. I only use this procedure between builds of the same ROM, and typically when the base Android version is the same (in this case 4.2.1). Backing up your device When upgrading I usually only backup with Titanium Backup and within ClockworkMod Recovery. Usually I don’t copy the backups to my desktop.