Possibly a JavaScript gone bad. A test would be to disable JS in the browser and recheck CPU usage. I often find sites that misuse JS or at least have bad coding and I have to turn it off just to make the site display without an endless delay. They're not crypto mining but really bad code.
Possibly a JavaScript gone bad. A test would be to disable JS in the browser and recheck CPU usage. I often find sites that misuse JS or at least have bad coding and I have to turn it off just to make the site display without an endless delay. They're not crypto mining but really bad code.