The high cpu usage is essentially the evidence for running certain power-saving measures that "look" like the task is using a lot of CPU time (it does, sleeping

The high cpu usage is essentially the evidence for running certain power-saving measures that "look" like the task is using a lot of CPU time (it does, sleeping the cpu). There's similar behaviour on linux but it shows as specific kernel threads related to intel power throttling, so it's more obvious what's happening.