Bug Editor's frame rate severely drops when Game tab is maximized since v. 2021.22f1

Ever since version 2021.1.22f1 (up until 2021.1.24f1) each time I maximize the Game tab, Unity starts stuttering and the game's frame rate gets very low. As soon as I make the Game tab return to its normal size, everything goes back to normal (no stuttering or frame rate drop). I even tested it with a brand new project. In versions 2021.1.21f1 or below this never happens.

Tested on a Mac Mini (Late 2012) running macOS Catalina 10.15.7. Does anyone else experience this problem? I couldn't find any mention about it in Unity's logs.

 

Try and check if some game object is selected in the scene. Some objects with custom editor options will impact performance.

or maybe is just a bug as you think it is

 

Thanks but it's not that since I'm testing with a brand new project which only has a simple 3D cube object which rotates in place (just a simple rotation script, no custom editor options).

 

Thanks but VSync doesn't seem to have any effect on the stuttering. The entire Unity UI is barely useable because of this. I'm testing with a brand new project which only has a single spinning 3D cube.

This doesn't happen in v.2021.1.21 or below. In fact, I've just downgraded the project I was testing on v. 2021.1.24 to v. 2021.1.21 and it runs smoothly.

 

I'm happy to report the problem got fixed in 2021.2