My understanding is FPS and UPS are in lockstep. If I'm getting 56 FPS 95% of the time my UPS is also 56 95% of the time? my cpu is 20% and gpu is 13% Numbers are the same even in a 60 hour save.

Can you post your log file? (Press Win + R, type in %APPDATA%\Factorio, click OK, File Explorer will open, factorio-current.log is the log file)

If "Use flip presentation model" didn't help, I suggest to try to experiment with Adaptive sync (or Enhanced sync AMD calls it, I think?) in Radeon ...

N
Hello, try to disable "Use flip presentation model" in graphics settings


After testing all the graphic settings I discovered forcing the render model to OpenGL gave me 95% 55-57 fps which is way better.

Someone suggested it's designed to run at an average of 60 fps, not 95% or 99% or 100% of ...

First 2 runs are default settings.
3rd run is Full Screen off

Still can't reach 60 fps 95% of the time
i5-7600K + RX 580