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Calculate the real cost to run your JS app or lib to keep good performance. Show error in pull request if the cost exceeds the limit.

SpeedTest by OpenSpeedTest™ is a Free and Open-Source HTML5 Network Performance Estimation Tool Written in Vanilla Javascript and only uses built-in Web APIs like XMLHttpRequest (XHR), HTML, CSS, JS, & SVG. No Third-Party frameworks or libraries are Required. Started in 2011 and moved to OpenSpeedTest.com dedicated Project/Domain Name in 2013.

YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages.