Factorio: Space Age is the first piece of software that my M1 shows performance issues with. I'm not building xCode projects or anything, but it is a great Mac. Maybe even the greatest.
There's a known issue on arm macs with external monitors that messes with the framerates. Hopefully it gets fixed soon because pre-space age factorio was near flawless in performance on my m2.
There's a few threads on the technical help forums that are tracking this -- I've subscribed to them because I'm super excited about them getting around to fixing it! :)
