If it's a M1 Macbook Air there's a very good reason you've never heard a fan!
Blows my mind how it doesn't even have a fan and is still rarely even anything above body temperature. My 2015 MBP was still going strong for work when I bailed on it late last year but the transition purely on the heat/sound emitted has been colossal.
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! :)
It's not just that; at times I pushed all CPU cores to 100% in the M1 Mini and even after 30+ minutes I couldn't hear the fan. Too bad the Macbook Airs got nothing but a literal aluminium sheet as cooling solution.
Blows my mind how it doesn't even have a fan and is still rarely even anything above body temperature. My 2015 MBP was still going strong for work when I bailed on it late last year but the transition purely on the heat/sound emitted has been colossal.