Recently experiencing sudden random stutter

I own a 2015 MacBook Air have been gaming heroes of the storm on it since the last season of 2016 on my main account, only recently, weather it’s the hots patch fault or MacBook update fault, recently there has been stutter in game, no problems in menus or anything like that, I used to be able to have a couple safari tabs open and run bots at the same time and now I have not even bnet open while in game in case it helps, I’m running minimum sound and graphic settings but highest resolution, there are points in game where I’m running fine but then the odd stutter REALLY messes me up… someone help idk what to do with this stutter… it also affects the mouse.