pagespeed - SERP Analysis

https://pagespeed.web.dev/

https://tools.pingdom.com/

https://gtmetrix.com/

https://kinsta.com/blog/google-pagespeed-insights/

https://developers.google.com/speed

https://developers.google.com/speed/docs/insights/v5/about

https://en.wikipedia.org/wiki/Google_PageSpeed_Tools

https://chromewebstore.google.com/detail/google-pagespeed-insights/hgjfcehigmlddmkeagmkmefejoifjnnd

https://www.loadview-testing.com/blog/google-pagespeed-insights/