Simply leaving Illustrator 22.0.1 open in the background, even while not actively using it, causes my MacBook Pro (MacOS High Sierra, 10.13.4) to run hot and drains the battery quickly, about 1% per minute. This limits my ability to use Illustrator without having my computer plugged in. This is easily demonstrated/replicated by having no other applications open. There should be zero CPU usage when Illustrator is simply open in the background and not in use.