Share your experience!
try to free more ram ... use greenify ...
reinstall the latest update with SUS or PCC
Be aware that apps like that might create issues
taskillers
task manager
antivirus
ram apps
booster apps
cleaner apps
cache apps
etc
actually i have also used clean master in 4.1.2 but ram usage the app shows is really decieving. no doubt It is useful for deleting junkfiles. relating to lagging isuue, it should be normal bcz ram management in 0.201 firmware is very bad. u will find good ram management only in custom roms.