Have you benchmarked the overhead of awaiting? I believe that in doing so you yield to the microtask queue and then your function has to be scheduled and run again. You could compare

        await yieldOrContinue('user-visible');
        doSomeWork();

against

        if (isTimeToYield('user-visible')) {
            await yieldControl('user-visible');
        }
        doSomeWork();

A few years back when I measured it on a fast laptop the cost was ~1µs to do `await 0;`