Replacement for Google Chrome PageSpeed Insights
Google Developers implemented a change: "PageSpeed Insights for Google Chrome has been deprecated. Please use the online version of PageSpeed Insights."
Web site for the tool: https://developers.google.com/speed/pagespeed/insights/
(basically Google eliminated the Chrome plugin and replaced it with a web site tool)
There is also a commercial tool from Verizon: Edge Optimizer
Dana Loiz1,186 Points
Another alternative might be AWRStudyr - also a free Chrome extension - http://www.awrstudyr.com/ It gives pagespeed on both mobile and desktop, and additional information on what can be done to improve the score. The extension basically pulls the information from the same source - Google's tool, but it's an extension - therefore faster to use for multiple check-ups.