performance-now works in both Node.js and browser environments, making it versatile for measuring time intervals across different platforms. It provides a consistent API for high-resolution time measurements.

web-vitals is primarily focused on web browsers, collecting performance metrics related to user experience. It is designed to work in client-side environments and integrates easily with web applications.

perf_hooks is designed for Node.js environments, providing APIs to measure performance in server-side applications. It leverages the Node.js event loop and timers to provide accurate performance data.

performance-now offers time measurements with sub-millisecond precision, making it ideal for benchmarking and performance testing. It is lightweight and provides accurate timing data for short intervals.

web-vitals measures performance metrics that are critical for user experience, such as LCP, FID, and CLS. While it does not focus on precision timing, it provides standardized metrics that are important for web performance optimization.

perf_hooks provides high-resolution timing APIs with sub-millisecond precision, allowing for detailed performance analysis and profiling. It is suitable for measuring fine-grained performance metrics.

performance-now can be easily integrated into both Node.js and browser applications. Its simple API allows developers to quickly add high-resolution timing measurements to their code.

web-vitals is designed for easy integration into web applications. It provides a simple API for measuring and reporting web vitals metrics, and it can be integrated with analytics platforms for automated reporting.

perf_hooks integrates seamlessly with Node.js applications, allowing developers to access performance metrics without additional setup. It is part of the Node.js core, making it easy to use in server-side code.

performance-now is useful for benchmarking functions, measuring time taken by specific code blocks, and conducting performance tests in both server and client environments.

web-vitals is focused on measuring and optimizing metrics that directly impact user experience, making it valuable for front-end developers, UX designers, and teams working on web performance optimization.

perf_hooks is ideal for profiling and optimizing server-side applications, monitoring performance bottlenecks, and analyzing the impact of code changes on Node.js application performance.

Measuring time with performance-now

const now = require('performance-now');
const start = now();
// Code to benchmark
const end = now();
console.log(`Execution time: ${end - start} milliseconds`);

Measuring web vitals with web-vitals

import { getCLS, getFID, getLCP } from 'web-vitals';
getCLS(console.log);
getFID(console.log);
getLCP(console.log);

Measuring performance in Node.js with perf_hooks

const { performance } = require('perf_hooks');
const start = performance.now();
// Code to measure
const end = performance.now();
console.log(`Execution time: ${end - start} milliseconds`);