So you get lag in any type of game for example, Reign Of Kings gives me a lot of lag but the menu screen doesnt lag.
So if you want to know how to reduce the lag on ANY STEAM GAMES then you don't want to lag.

The FIRST thing to do is to go to your library, then right click any game that gives you lag, click "properties", then click "set launch options". COPY THIS
then paste it.

-high

Now open the game and 100% no lag, just trust me, and thank you for reading this.
Comment if this worked!