Stoyan Stefanov

Web developer, author, speaker, Facebook engineer, ex-Yahoo,
creator of, YSlow 2.0 architect and guitar virtuoso wannabe

The business, psychology and technology of high-performance web apps

Book of Speed turtle

by Stoyan Stefanov

[INCOMPLETE] Parallel downloads

(or Non-blocking components)

When does JavaScript block other components? When do stylesheets block? Parallel download limits in the browsers.