How to capture and analyze website loading speed with Puppeteer?

To capture and analyze website loading speed with Puppeteer, you can follow these steps:

Install Puppeteer: First, you need to install Puppeteer in your project. You can do this by running the following command:

npm install puppeteer

Create a Puppeteer script: Create a JavaScript file where you will write your Puppeteer script to capture and analyze the website loading speed. Here's an example script that captures the website loading speed of a given URL:

const puppeteer = require('puppeteer');

(async () => {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  
  const url = 'https://www.example.com';
  await page.goto(url, {waitUntil: 'load'});
  
  const performanceTiming = JSON.parse(
    await page.evaluate(() => JSON.stringify(window.performance.timing))
  );
  
  const loadTime = performanceTiming.loadEventEnd - performanceTiming.navigationStart;
  console.log(`Website ${url} loaded in ${loadTime} ms`);
  
  await browser.close();
})();

Run the Puppeteer script: Save the script to a file (e.g., analyze-speed.js) and run it using Node.js:

node analyze-speed.js

Analyze the results: The script will output the website loading time in milliseconds. You can analyze this data to identify any performance bottlenecks and optimize your website loading speed.

By following these steps, you can easily capture and analyze website loading speed with Puppeteer.