I have the same hardware and play everything at ultra at 2000something x 1440 resolution. I did not measure FPS, but it does not stutter and videos are sharp. This is on the internal display. I have to see how it performs on my 4K display. Any good method to measure FPS?
2000somethingx1600 is on the internal Display of that MacBook Air and it might be that my expectations to graphics FPS wise are not very high. Normally I play Civilisation or Kerbal Space Program and one of my most loved games is Master of Orion 1 on a whooping 640x480 pixels. I’ll check later, what FPS I get.
Ok. KSP and its 5 SPF gameplay did lower my expectations to modern games, apparently. Looks like I run BG3 around 15 to 25 FPS 🙃 . This is on the internal display. I didn't test the external one.