Lighthouse is an open-source tool that is used to run an audit against your web pages and provides scores and suggestions for improving page performance, accessibility, SEO, and more. The score is determined by comparing your results against performance data of other websites. The website speed test from Dotcom-Tools includes Lighthouse reports with test runs, along with waterfall charts and performance data. Learn more about the various Lighthouse recommendations to optimize your web pages and the user experience.
Lighthouse Optimizations
Web Vitals
Cumulative Layout Shift
First Contentful Paint
Largest Contentful Paint
Speed Index
Time to Interactive
Total Blocking Time
How to Avoid an Excessive DOM Size
How to Avoid Chaining Critical Requests
How to Avoid CSS @import
How to Avoid Document.write
How to Avoid Enormous Network Payloads
How to Avoid Large Layout Shifts
How to Avoid Long Main-thread Tasks
How to Avoid Multiple Page Redirects
How to Avoid Non-composited Animations
How to Avoid Serving Legacy JavaScript to Modern Browsers
How to Combine Images Using CSS Sprites
How to Defer Offscreen Images
How to Efficiently Encode Images
Eliminate Render-blocking Resources
Enable Keep-Alive
Enable Text Compression
Ensure Text Remains Visible During Webfont Load
Keep Request Counts Low and Transfer Sizes Small
Lazy Load Third-party Resources with Facades
Minify CSS
Minify JavaScript
Minimize Main-thread Work
Preconnect to Required Origins
Preload Key Requests
Preload Largest Contentful Paint Image
Properly Size Images
Reduce Initial Server Response Time
Reduce JavaScript Execution Time
Reduce the Impact of Third-party Code
Reduce Unused CSS
Reduce Unused JavaScript
Remove Duplicate Modules in JavaScript Bundles
Replace Large JavaScript Libraries with Smaller Alternatives
Serve Images in Next-gen Formats
Serve Static Assets with an Efficient Cache Policy
Use a Content Delivery Network
Use Explicit Width and Height on Image Elements
Use HTTP/2 for all Resources
Use Passive Listeners to Improve Scrolling Performance
Use Video Formats for Animated Content
User Timing Marks and Measures
Lighthouse
Lighthouse is an open-source tool that is used to run an audit against your web pages and provides scores and suggestions for improving page performance, accessibility, SEO, and more.
PageSpeed Terms
PageSpeed Insights is a tool created by Google that reports on the performance of a page on both mobile and desktop devices, and provides suggestions on how that page may be improved.
YSlow
YSlow is an open-source website analysis tool that can be used to identify web page performance issues. Learn more about the YSlow to enhance your web pages and the user experience.