Exactly why do you want to do this? You might be trying to solve a “problem” that doesn’t really exist.
If you are doing this because you are on the verge of running out of computing resources and risking clicks and audio nastiness, then by all means you should do this.
But if your motivation is just that it somehow seems better or more computing efficient to see your CPU running at 47% rather than 76%, then you are investing a bunch of effort in solving something that won’t really benefit you.
The truth is our computers are ALWAYS consuming ALL of their CPU capacity. The ‘use by’ date on every CPU cycle is now, a moment ago that cycle couldn’t be used and a moment from now it won’t exist. Either a cycle is being used to do some useful work for you (play sounds, talk network, etc.) or if it is not being used to do some work it is just thrown away. CPU cycles are not like dinner leftovers, you can’t use them later.
Saving CPU cycles just for the sake of saving them gains you nothing useful. And if you spend a bunch of time trying then it is costing you.