What is event loop optimization in JavaScript runtimes?

Event loop optimization reduces blocking tasks and improves responsiveness in async JavaScript execution.

The event loop manages execution of synchronous code, microtasks (Promises), and macrotasks (timers, I/O). Optimization involves minimizing blocking operations, breaking heavy computations into chunks, using microtask queue efficiently, and avoiding long-running synchronous loops. Poor event loop usage leads to UI freezes and increased latency in Node.js servers. Techniques include using worker threads, batching tasks, and yielding control using setImmediate or requestIdleCallback.