This game is very demanding on cpu performance and only on one core so i have a feeling that’s the issue. I would recommend the Mod Extra Map Options and play on a small map. You will almost never use more than the space of a small map anyway and it can do wonders 
Also since it’s a Laptop i’d recommend to always have the power cord in while playing because if i don’t remember this wrong most of them lower performance when not connected to the wall to save battery
https://steamcommunity.com/sharedfiles/filedetails/?id=1385348318