I recently bought and installed a new game through steam 'besiege' if you were wondering, and it ran really hot on my computer. On other games such as CS:GO for example you can cap the FPS in game making my computer not run as hot so less background noise.
I looked around and for this game there doesn't seem to be this option. (I've had similar problems with other games) My Mac (13" macbook pro retina 2013) runs at about 90 - 105 degrees with this game and I know the laptop won't be damaged as it'll thermal throttle and turn up the fans but I'd rather have a worse running game and not so much background noise due to the fan running at 6000 rpm...
My first thought was limiting the resources the game got, I'm not sure if this would affect the heat produced.
But anyways to just make the game run worse to decrease heat output. (It's capped at 60 fps I believe) down to around 20(ish) as this is perfectly bearable visually.
Any help would be greatly appreciated! :D