Originally Posted by Torvi
So ive got myself Nexus 4 recently and after 2 days of heavy ads on every possible app i decided to root it and put cyanogen mod. What ive experienced due to it is less fps on games such like Real Racing 3 compared with stock 4.4.4 kitkat
Try to check out a few threads on XDA about 'performance' kernels. I find that the majority of XDA are battery-life craving individuals. Therefore, most of the stock kernels for each ROM lean more towards power efficiency, rather than sheer performance. If you don't feel like delving into kernels (it's actually just as simple as flashing a ROM), you can always download something like SetCPU to monitor the CPU speed and activity during an app...if it's being throttled, you can go into SetCPU and tweak it back to max/stock speeds.