When Hearthstone is not the active window (out of focus, minimized, etc) the game’s CPU and GPU usage skyrockets and stays there for no reason. If I leave Hearthstone in the background, my GPU (3080TI) usage shoots up to max clock and 75% usage. When it’s in focus, the clock is only 3/4 of max and usage ~40%. CPU usage also goes up by about 15% when hearthstone is in the background.
Background Usage:
https://imgur.com/a/JqS6fkY
Brought to foreground. (see the large drop in usage)
https://imgur.com/a/fs5Jsj0
After being in the foreground a while you can see stable, mild clocks /usage.
https://imgur.com/a/VW3iwOH