!rant #tip

Windows 10 - service host high cpu usage

Stop the superfetch service and it would be down to normal.

You should checkout the description of the superfetch service... Lol ):D

It compresses unused memory but all memory it compresses shows up under the superfetch process.

Well turning off Superfetch helps more with disk usage going crazy, especially if you have HDD.
Turning off Memory Diagnostics processes in Task Scheduler will actually have better impact on CPU usage when memory is being compressed, because that is whats actually using the CPU in the process. Compressing alone works just fine.
Then again, some might argue that turning off diagnostics might lead to possible errors etc. Personally I had no issues, and it works much nicer.