Trinity kernel brings overclocking and better battery to Galaxy Nexus
The boost comes from the custom Trinity kernel by Morfic. Trinity kernels are known for boosting performance, but this one will also help battery life. The trick is that this custom kernel overclocks the CPU while also undervolting, as well as underclocking the CPU when the phone is in sleep mode in order to both kick up performance and add battery life.
The Trinity kernel is available for both CDMA and GSM variants of the Galaxy Nexus, and you just need to have your device rooted and unlocked.