I am in 2020.1.1. If I go into play mode, CPU usage in task manager hovers around 10% as expected, with no abnormal performance in the profiler. But as soon as I tab out of Unity Editor while still in play mode, CPU usage skyrockets to 100% on all 6 cores. Drops back down to 10% as soon as I tab back into Editor. Does not happen in old 2019.1/2019.2 backups of the same project. Upgraded copies of those backup projects to 2020.1.1 and the problem occurs again, which leads me to believe it has something to do with 2020.1.1 in some way, even if it's due to how my OS (Fully updated Windows 10) is failing to handle 2020.1.1 as a background process. All drivers for all my devices are also up to date. Still happens in a completely empty scene and with no custom editor windows in my project. The only windows open are the default Unity ones, aka SceneView/GameView/Hierarchy/Inspector/Console/Profiler/etc. Even if they're not rendering anything the problem persists. What's weird is every new project I make to test it seems to be at 60% CPU in play mode with editor both in focus and out of focus, which is distinctly different than the problem I described, but at the same time 60% seems too high for an empty project, especially since my bloated project is only at 10% when in play mode and editor is in focus. New empty projects with 2019.1 or 2019.2 are at <20% when in play mode when in focus or not so there's something wrong with 2020.1 in some way, or at least how my OS is handling the process. Also if I go in play mode and let the game run while alt tabbed for 30+ minutes, memory usage climbs, so there's a memory leak in some way, but it doesn't visibly go up when I'm watching it, I just come back to 100% memory usage being used by Unity Editor after noticing I had left it in play mode for awhile. I have absolutely no idea how to approach this issue.