YSlow is an open-source website analysis tool that can be used to help identify web page performance issues. Originally released by Yahoo in 2007 as a web development tool, it was one of the first website development tools in the market. One of the major differences between YSlow and Google PageSpeed, for example, is that YSlow is a plugin that must be installed in the browser. Today, Chrome dominates the market, so tools like PageSpeed are more relevant. Additionally, most of the YSlow extensions are no longer available. Learn more about the YSlow recommendations to enhance your web pages and the user experience.
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 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.