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phone is good and fast but i get a little lag for a sec and back fast and it happen from time to time
clean master (pro) https://play.google.com/store/apps/details?id=com.cleanmaster.mguard&hl=en (you can use another version).
it has three things. phone boost,remove junk files, antivirus check . as you said your phone lag a little so phone boost can help you.
tell me if it works.

It's not going to work.
Clean Master or anything by Cheetah Mobile are probably the worst things you can install on your phone. Their apps are snake oil and their sole function is to mine your personal data to sell on to 3rd parties for advertising purposes.
http://androidforums.com/threads/pu...k-killers-ram-optimizers-and-the-like.896663/
OP, when does your phone lag? When unlocking? What phone are you using?
i think the lag is come when my phone get hot is that true
So, tell me which can remove the lag?