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My talk from this year's We Love Speed is on YouTube! 👇 In "Tight Mode: how browsers REALLY load web pages", I take a very deep/very nerdy dive into why browsers sometimes intentionally delay loading resources, why they all do it differently, and why they should *stop clowning around* 🤡 #webperf

These differences can be quite stark, such as in the screenshot below, where 1 simple Web page is loaded completely differently in the 3 main browsers... This means it's difficult to build pages that perform consistently well across them, and features like fetchpriority and preload don't help much 🤡

This talk is complementary to my talk at @perfnow.bsky.social last year 👇 on resource prioritization, where I didn't have time to fit in the "tight mode" details (they were enough for a whole new talk by themselves!) Big thanks to @patmeenan.com in particular for all his help (and work!) on this.

Probably also of interest to @tunetheweb.com (thanks again for the photoshoot Barry!), @csswizardry.com, @twnsnd.com, @yoav.ws, and @imkev.dev, who's one of the few people who actually researched this topic as well (imkev.dev/fetchpriorit...)