The Wayback Machine - https://web.archive.org/web/20191210110510/https://developers.google.com/speed/pagespeed/insights/

Make your web pages fast on all devices

ANALYZE
  • What's New
    Read the latest Google Webmaster Central posts about performance & speed.
  • Web Performance
    Learn more about web performance tools at Google.
  • Give Feedback
    Have specific, answerable questions about using PageSpeed Insights? Ask your question on Stack Overflow. For general feedback and discussion, start a thread in our mailing list.
  • About PageSpeed Insights
    PageSpeed Insights analyzes the content of a web page, then generates suggestions to make that page faster. Learn more.