Use Cookie-free Domains

We discussed what HTTP cookies were in a previous section and why keeping the cookie file size to a minimum is another method that can assist with helping boost page performance. While having cookies great for delivering a better user experience, sometimes serving up a cookie-free domain is beneficial, such as when delivering static content, like images or CSS files. With these elements, it is not necessary to serve up a cookie with them. This would only create more unnecessary network traffic for content that is static and not changing. Implementing a cookie-free domain allows developers to break up content that uses cookies with content that does not, helping to improve site performance.



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 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.