Thanks for the response, most certainly:

1. Attached is a zip with two recordings from an external device, one from 1.1.80 and one from 1.1.81.

2. I probably ought to anyway

Can my machine be of service for debugging? I can hold off on upgrading if you want to run any tests with it, etc.

Vel wrote: Mon Jul 17, 2023 7:24 pm Is there an easy way to downgrade factorio with Steam?

Very easily

Right click Factorio in your left-land library list, click properties, click betas, then select the version you want.

1.1.80 is the latest version where vsync works for me.

Between 1.1.80 and 1.1.81, something has changed about the VSync setting! It looks like it's not being applied as intended on my intel macbook in 1.1.81.

As early as 1.1.81, and as recent as 1.1.87, I am seeing screen tearing at the top of the screen that is reminiscent of VSync not being enabled ...