I am not sure if it relates, but this happens to me on some pages. If I turn off all styles (CSS), then the CPU usage drops to 0. In my case, CSS is the culpri

I am not sure if it relates, but this happens to me on some pages. If I turn off all styles (CSS), then the CPU usage drops to 0. In my case, CSS is the culprit because the same page does this on Chrome as well.