[pmarreck]

I'm not saying it would be trivial, but I bet that once you figure out a workable pattern, you could replicate that on other games.

One idea that might be relatively easy to implement- Slow the framerate down to something super slow instead of fully stopping

[thunderfork]

Ah, but now your pause menu feels like total garbage to use!

[account42]

You can adjust the frame rate based on whether the user is actually interacting with the window and whether the window is currently not shown at all. This is not hard to do at all, burning CPU and CPU cycles just to show a static frame (or nothing at all while the window is minimized) just means the developer doesn't care.