If you want a fast, stable ROM with lots of battery life, you might want to give the Android Revolution HD ICS ROM a go. Based on Android 4.0.2, this ROM is much faster over stock with optimizations that will give you better life.
I’ve tried this ROM on other Android devices like my EeePad Transformer and is from experienced ROM developers so I suggest you to give it a go and let me know what you think of this ROM.
Download ROM here:
Download Android Revolution HD for Galaxy Nexus GSM
Download Android Revolution HD for Galaxy Nexus CDMA/LTE
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You will need a rooted Galaxy Nexus to install all ROM/kernels.
NOTE: PLEASE ONLY INSTALL ROMS INTENDED FOR YOUR VERSION OF GALAXY Nexus! Otherwise you WILL BRICK YOUR PHONE and I will not be responsible!
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Galaxy Nexus GSM ROMs
Galaxy Nexus Sprint ROMs
Galaxy Nexus Verizon ROMs