sitespeedio/sitespeed.ioJavaScript
Sitespeed.io is an open source tool that helps you monitor, analyze and optimize your website speed and performance, based on performance best practices advices from the coach and collecting browser metrics using the Navigation Timing API, User Timings and Visual Metrics (FirstVisualChange, SpeedIndex & LastVisualChange).
(4434 star) (573 fork) (5 issue indicizzate) (4 good first issue aperte)