Why is sequential await in a loop slow in JavaScript?
Because each await waits for the previous operation to finish before starting the next. For independent operations, this is unnecessary. Use Promise.all to start all operations at once and await them together.
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More FAQs in Async/Await and the Event Loop in JavaScript
await pauses the async function and schedules the rest as a microtask. Control returns to the caller, who continues running synchronous code. When the stack is empty, the rest of the async function runs as a microtask.
Yes. async functions always return a promise. await pauses until a promise settles. The rest of the function after await runs as a microtask. async/await is syntactic sugar over promises.
Use try/catch around the await call. If the awaited promise rejects, the catch block runs. This is cleaner than .catch() with promise chains.
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