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AMP JS: a JavaScript library that takes care of rendering AMP HTML.AMP HTML: it’s HTML but with some restrictions to guarantee reliable performance.The AMP project is essentially three core components: The AMP project enables developers to create websites that are fast, high-performing and with great user experiences across all platforms (desktop browsers and mobile devices). The AMP (Accelerated Mobile Pages) project is an open-source project that aims to make the web faster. If you have many tabs open, the extension will be invoked on the active tab. Page performance is a Chrome extension that can be used to run a quick performance analysis.

Npm imageoptim how to#

GTmetrix is an online tool that gives you insights into your website performance (fully loaded time, total page size, number of requests etc.) and also practical recommendations on how to optimize it.

Npm imageoptim install#

You can install YSlow by dragging and dropping the bookmarklet to your browser’s bookmark bar. This tool analyzes web pages and helps you discover the reasons for slowness based on Yahoo’s rules for high-performance websites. YSlow is a JavaScript bookmarklet that can be added to your browser and invoked on any visited web page. The configuration file can be something like: 5. Then run it from the terminal by providing the target URL and a JSON configuration file: lightcrawler -url -config lightcrawler-config.json Start by installing the tool via npm: npm install -save-dev lightcrawler You can use Lightcrawler to crawl your website then run each page found through Lighthouse. We’ve got an in-depth look at Lighthouse in our PWA performance month post.

lighthouse-cron: a module which can help you track your Lighthouse scores and metrics overtime.

calibreapp: a paid service, based on Lighthouse, that helps you track, understand and improve performance metrics using real Google Chrome instances.

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treo: Lighthouse as a service with a personal free plan.webpack-lighthouse-plugin: a Lighthouse plugin for Webpack.Make sure to check these Lighthouse-based tools: You can use Lighthouse programmatically to build your own performance tool or for continuous integration. Or you can install Lighthouse, from npm, on your system with: npm install -g lighthouse You can find the extension from the Chrome Web Store. It’s an indispensable tool for measuring, debugging and improving the performance of modern, client-side apps (particularity PWAs). It’s integrated into Chrome’s DevTools and can be also installed as a Chrome extension or CLI-based tool. Lighthouse is an open-source tool for running audits to improve web page quality. Or Docker: docker run -shm-size =1g -rm -v ' $( pwd )':/sitespeed.io sitespeedio/sitespeed.io -video -speedIndex You can install these tool(s) using npm: npm install sitespeed.io -g PageXray: extracts different metrics (from HAR files) such as size, number of requests, and so on.Chrome-HAR: helps you compare HAR files.

Browsertime: collects metrics and HAR files from your browser.Coach: gives you performance advice and fixes for your website based on best practices.