Quadrant benchmark using the default Omega Rom Jelly Bean v31 kernel. Battery life is excellent and as you see also perfoming very nice!
More on Omega ROM v31 Jelly Bean @ XDA: http://forum.xda-developers.com/showthread.php?t=1663656
Startup Manager is an Android paid application that cleans your startup programs. You can free more RAM in your device and make it faster, gain more RAM and lag free!
https://play.google.com/store/apps/details?id=imoblife.startupmanager.full&hl=en
Quadrant Benchmark Samsung Galaxy s3, Omega ROM v30 Jelly Bean and Phenomenal 4.0 Kernel Extreme Edition.
Omega ROM: http://forum.xda-developers.com/showthread.php?t=1663656
Phenomenal Kernel: http://forum.xda-developers.com/showthread.php?t=1917234