How is this Website so fast!?

Breaking down the McMaster Carr website and the techniques they use to make it so dang fast. 00:00 - Intro 00:38 - Server Rendered HTML 00:54 - Prefetching HTML 02:02 - CDN Caching 02:36 - Client Caching with Service Worker 03:29 - Preloading Assets 05:33 - Critical CSS 06:49 - LCP 07:36 - Fixed Size Images 09:02 - JavaScript 10:44 - jQuery and YUI 12:15 - Slow Pages 12:44 - Wrap Up