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JavaScriptBeginner#async
JavaScriptIntermediate#async#performance
How do you run async calls in parallel with async/await?
Start all the promises first, then await them together with Promise.all. Awaiting inside a loop serialises the requests and multiplies latency.
Example
// slow (sequential) for (const id of ids) await fetchUser(id); // fast (parallel) await Promise.all(ids.map(fetchUser));