#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.
#Npm imageoptim free
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.
![npm imageoptim npm imageoptim](https://miro.medium.com/max/1400/1*W6eT6DkV-mziehXgPA2Ksw.png)
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.
![npm imageoptim npm imageoptim](https://dab1nmslvvntp.cloudfront.net/wp-content/uploads/2017/11/1511140640trimage.png)
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
![npm imageoptim npm imageoptim](https://dbushell.com/images/blog/2013/rasterize.png)
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.