My LG 4X HD was running 4.1.2 JB and using Optimus UI. Using it daily, I experienced lags in occasions such as: entering app drawer, presing the home button while running some apps, unlocking the phone etc. So I turned off animations, device was suffering lag less often, but still it annoyed me. I decidet to install CM 10.1 hoping that lags will dissapear, but nothing changed dramitacally. Phone runs smoother now, but it's still laggy(Animations turned off even now). I have installed cca. 10 apps on the device, and it shouldn't be a big problem for device with quad core and 1GB of RAM. Any ideas what could it be?