Performance drops significantly when running build on fullscreen

Reproduction steps:
1. Open the user's attached project on WebGL
2. Build and run it
3. Enter fullscreen in the game and observe the framerate

Expected result: The scene does not have framerate issues
Actual result: The scene is lagging

Reproducible with: 2021.2.0b1, 2021.2.17f1, 2022.2.0a9
Not reproducible with: 2019.4.37f1, 2020.3.32f1, 2021.2.0a21

Note:
Seems to only reproduce on some machines/OS versions