I’m surprised you’re only at medium settings, my M2 Pro is handling 1440p at mostly maxed settings (disabled DOF as it’s too aggressive and only double buffered vsync. I don’t have an FOS readout but it’s pretty good compared to before with Crossover and medium settings.

Edit: followed the terminal command to show the Metal info and BG3 floats around 45-50fps ingame. Haven’t gone back to Act 3 yet so still not sure how it’d handle it. The FPS is stable enough that as a turn based RPG it’s quite playable.

Parallels was rough, couldn’t get Crossover to work at first, and also played the first few hours in a Windows VM. Did you also have missing textures everywhere?