I won't call myself an expert but i used to squeeze every single fps out of my old 820m using Nvidia control panel.
Power management mode - Prefer maximum performance
Texture filtering quality - High performance.
You can also turn off anti aliasing but i would rather deal with it in game. Everything else can be left default. If you want you can just apply this to the games using program settings.
At last put your pc on performance mode when you play games.