Entire app became unresponsive for several minutes

Now I'm on "Version 80.0.320.5 (Official build) Dev (64-bit)" Was using it for a while and laptop fan started going nuts (Edge was using the cpu).  Kept closing tabs to see which one it was, but with no browser windows open, the browser process was still using 240% cpu time. The app was still responding fine though. I've attached another sample taken with no windows open but while it was using high cpu. Also see attached screenshot of the task manager.  Hope it helps.