Speed and Performance Optimization Tools for websites

Gift of Speed

https://www.giftofspeed.com/

Google PageSpeed Insights

https://developers.google.com/speed/pagespeed/insights/

Built by Google Lighthouse  – Tools for Web Developers  |  Google Developers

https://developers.google.com/web/tools/lighthouse

GTmetrix | Website Performance Testing and Monitoring

https://gtmetrix.com/