Game booster is a third party tool/software that only frees up some RAM usage by disabling any sorts of background applications, if you're running any.
It's not always a guarantee that you can get better frames with it turned on. Of course you'll notice a significant boost, only if you were running any programs while playing games.
If you want better performance, best thing you can do is buy a better one or switch to a desktop PC, because laptops' offer little to no upgrades.
To fix game lag problem you need to have a service optimizer. You can also do it manually::
Click Start, type services.msc in the Search box. Press ENTER. Right click and stop each service which is not necessary for you.
Also you can use a tool like PCFresher, it has feature of service optimizer.