Use queueMicrotask() for PerformanceObserver callbacks #660
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Replace `Promise.resolve().then()` with `queueMicrotask()` for more explicit and efficient microtask scheduling
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This PR replaces
Promise.resolve().then(){ withqueueMicrotask()when scheduling thePerformanceObserver` callback.This change makes the intention of microtask queuing clear and documents the Safari workaround, and also reduces the overhead of creating unnecessary promises.
queueMicrotask()is part of the Baseline widely available set, so this change should not introduce any new browser compatibility issues.