Recording date: 2019-08-20 John Papa @John_Papa Ward Bell @WardBell Dan Wahlin @DanWahlin Katie Hempenius @KatieHempenius Resources: Katie Hempenius on Twitter Katie's talks Nostate Prefetch Katie at Smashing Conf talking about code splitting and other performance topics Katie's talk on Speed at Scale Why Web Performance Matters Web Performance made easy Lighthouse tools for web performance Server Compression with Express .NET Core compression nginx compression express compression oh no, stylesheet grows grows grows Unused CSS Authoring critical above the fold css Addy Osmani's Critical CSS tool CSS and CI Time to Interactive (TTI) Latency vs bandwidth TCP Slow Start Final Tips Google Lighthouse Cave Diver Jill Heinerth CSS Tricks Google Developers Timejumps 02:24 Guest introduction 07:01 What is web performance at Google? 10:37 Sponsor: ag-Grid 12:00 What's so important about lazy loading and code splitting? 19:59 Does script order matter? 20:58 What are the things most of us do wrong? 31:58 Sponsor: IdeaBlade 33:02 What is TTI and why should we care? 36:07 Do service workers change the equation? 40:17 Latency vs bandwidth? 44:41 Final tips