Do SQL OS Background Tasks Yield to Normal Tasks?
The background tasks are there for a purpose &amp; are generally necessary so everything else being equal I wouldn't try and turn them off. I believe that some of them at least do act as you describe and reduce their pressure when CPU load is high - ie Query Store.
A detailed answer to this question would be level 500 internals and extremely long - probably better to wait until your CPU is stuck with a way higher load than 22%. There is undoubtedly lower hanging fruit to optimize