What methods are used to improve code performance efficiency in Node.js?

To improve code performance in Node.js, the following methods are often used:

• Asynchronous and non-blocking I/O: using async/await, promises, and callbacks to prevent blocking the main thread.
• Caching: storing the results of expensive operations in memory or external caches (e.g., Redis) for reuse.
• Using clusters: running multiple Node.js processes to distribute load on multi-core systems.
• Memory optimization: avoiding memory leaks, proper management of large objects.
• Profiling and monitoring: using tools (e.g., Chrome DevTools, Clinic.js) to identify bottlenecks.
• Minimizing synchronous operations: avoiding synchronous functions that block the event loop.

Example of using a cluster to distribute load:

const cluster = require('cluster');
const http = require('http');
const numCPUs = require('os').cpus().length;

if (cluster.isMaster) {
  for (let i = 0; i < numCPUs; i++) {
    cluster.fork();
  }
} else {
  http.createServer((req, res) => {
    res.writeHead(200);
    res.end('Hello World');
  }).listen(8000);
}