Fixing a parallax scrolling website to run in 60 FPS

I recently visited a parallax scrolling website that was just one of thousands of different parallax scrolling websites out there. One thing that I immediately noticed was that the scrolling FPS of that page was really bad. I suspected that there would be room for improvement in their parallax implementation, and I wanted to take […]

CSS `will-change` Property

#header { will-change: opacity; } Modern CSS renderers perform a number of complex optimizations in order to render webpages quickly and efficiently. Unfortunately, employing these optimizations often has a non-trivial start-up cost, which can have a negative impact on the responsiveness of a page. The will-change property defined in the CSS Will Change Module allows […]

Velocity.js – Accelerated JavaScript animation

Velocity is a jQuery plugin that re-implements $.animate() to produce significantly greater performance (making Velocity also faster than CSS animation libraries) while including new features to improve animation workflow. Velocity includes all of $.animate()’s features while packing in color animation, transforms, loops, easings, sequences, and scrolling. Velocity is the best of jQuery, jQuery UI, and […]

Parallax Done Right

Parallax has become, for better or worse, an increasingly popular web trend. Done right, it feels awesome. The problem is, a vast majority of sites using parallax suffer from terrible scroll performance. A good refresher on how to do high performance animations Parallax Done Right → Related: High Performance Animations → 2D transform’s translate() vs […]


A jQuery/Zepto plugin I’ve been using a lot lately to debounce (= attach with delay) event handlers. To be applied on scroll events for example, as you don’t want one long single scroll to pull down the performance of your webpage by constantly triggering the attached handling function. $(window).on(‘scroll’, function(e) { // update stuff *after* […]