Is it just me that gets 1 core at 100% CPU when paused in a brand new Unity project with Unity 2019.3.1f1 (and .0 before it IIRC)? (I'm using 'legacy' 3D -- non-SRP profile in case that makes a difference). I'm sure earlier 2019 builds and definitely 2018 would use ~0% CPU usage where pausing the game and/or switching windows with "don't run in background" set. I've attached a screenshot showing (my CPU has 8 cores). It's easy to notice on my laptop where I can hear the fans whiring indicating something is amiss. Obviously it's gobbling up my laptop's battery and quietly killing the planet by spewing out extra CO2 for all the desktops! I initially assumed it was caused by some of my Editor scripting but after investigating for a bit, I couldn't figure it out since nothing seemed to show up in the Profiler. Of course then I tried a vanilla project! I've logged a bug but not had any response after 3-ish working days so thought I'd ping here in case I was doing something ultra-dumb (it's happened before ) Cheers for the help!