Never heard of → libstrangle? It's a FPS limiter library which can be LD_PRELOADed in order to run a game with a specified max FPS. I'm using it to reduce my laptop's heat exhaust and to keep my hot-headed Vega chilled. I've built a simple Debian package with the help of "checkinstall". It's not (yet) in my repo but you can safely download (AMD64) it from my site.