Class Central is learner-supported. When you buy through links on our site, we may earn an affiliate commission.


Browser Rendering Optimization

Google via Udacity


Performance matters to users. Web developers need to build apps that react quickly and render smoothly.

Google performance guru Paul Lewis is here to help you destroy jank and create web apps that maintain 60 frames per second performance.

You'll leave this course with the tools you need to profile apps and identify the causes of jank. You'll explore the browser's rendering pipeline and uncover patterns that make it easy to build performant apps.


  • The Critical Rendering Path
    • Introduction to the course with Paul Lewis.,Learn how the browser turns HTML into pixels on the page,See how different CSS styles affect the rendering pipeline differently.
  • App Lifecycles
    • How to recognize the four distinct phases in an app's lifecycle: Response, Animation, Idle and Load (RAIL).,How your frame budget changes depending on where the user is in RAIL.,Practice thinking through app workloads at different stages in RAIL.
  • Weapons of Jank Destruction
    • How to make sense of the Timeline panel in Chrome DevTools.,Practice profiling a few different apps to find the source of jank.
  • JavaScript
    • How to optimize JavaScript to hit 60fps during animations.,How to move expensive JavaScript operations off the main thread and into Web Workers.,How to debug a janky copy of a production quality app - the QR Snapper.
  • Styles and Layout
    • Learn how accessing the wrong CSS properties can create loads of extra work for the browser.,Learn how to debug multiple instances of Forced Synchronous Layout.
  • Compositing and Painting
    • Practice profiling layer and paint performance with the paint profiler tool in the DevTools Timeline.,Learn how to optimize layers to reduce the number of steps the browser needs to take to render each frame.,Demonstrate everything you've learned about performance as you de-jankify the News Aggregator App!

Taught by

Cameron Pittman and Paul Lewis


4.0 rating, based on 1 Class Central review

Start your review of Browser Rendering Optimization

  • Profile image for Chris Duncan
    Chris Duncan

Never Stop Learning.

Get personalized course recommendations, track subjects and courses with reminders, and more.