Lag problem

I bought a new laptop (hp dm 4 series M450 @ 2.40GHzCore i5) 5 days ago and I have some problems with the system.
The problem is i can play any games on my laptop while the battery is charging but when i unplug the adapter (Online games or Install games) become lag.

I have tried high performance thing, but still laggy.
Plz help

First of all here we are a linux forum. Second, your operating system is… :
If you want to play only games, linux is not for you(you can play with wine but not all of them)
Maybe battery is the problem, go to your shop who buy this problem and tell them your problem about your battery.

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