A lightweight JavaScript library for display the frames per second. No dependencies.
var fps = new FPS();
fps.start();
javascript:(function(){var script=document.createElement('script');script.onload=function(){var fps=new FPS();fps.start();};script.src='//rawgit.com/bornbit/fps/master/dist/fps.min.js';document.head.appendChild(script);})()
MIT License