This seems to be the same issue I raised back in July for version 2.0.60 (post ID: 677557)

Yeah at first I thought it could be vsync related, but those last tests were done with vsync off. I tried in a new sandbox save with UPS uncapped and got the same results as my original screenshots (~3800 UPS but FPS locked at fractions of monitor refresh rate).

Changing refresh rate to 60Hz resolves the issue on Metal, game runs at 60 FPS.

120Hz also seems OK, game runs at 60 FPS.

Interestingly if I set the monitor to 95Hz, the game runs at 47.5 FPS. Seems for some reason since this update the game is running at fractions of the monitor refresh rate.

I ...

I have done some more testing as I noticed that Vsync was impacting my performance on OpenGL. Looking at the difference between Flip[on] (Vsync On) and Flip[off] (Vsync Off) time usage on the debug screen, I checked to see if Vsync was causing the issue on Metal. Vsync did not affect this issue on ...

Screenshots, save file and latest log file attached.

Updated from 2.0.55 to 2.0.60, Factorio now runs at a locked 48.0 FPS & 60.0 UPS when the Metal (experimental) backend is used. This occurs on both Singleplayer and Multiplayer.

This behaviour was not experienced with the previous release 2.0.55, FPS and UPS were both 60.0 while using Metal ...

Since updating to 2.0.42 I started getting desyncs connecting to my server.
Two desync reports uploaded:
2025-03-23 I desynced immediately then could reconnect without issue
2025-03-24 multiple times in a row I desynced when connecting. I've attached an excerpt of the server log from the exact ...