ShowSlow | Tools | Networking Performance
Show Slow is an open source tool that helps monitor various website performance metrics over time. It captures the results of YSlow, Page Speed Insights, WebPageTest and dynaTrace AJAX Edition rankings and graphs them, to help you understand how various changes to your site affect its performance.
ShowSlow.com is a demonstration site that continuously measures the performance of a few reference web pages. It also allows for public metrics reporting, and keeps data for 90 days.