Rethinking Reactivity
Rich Harris introduces Svelte 3 and argues that reactivity belongs in the compiler, not the runtime — the talk that crystallised the case for disappearing frameworks.

Rich Harris on frameworks, the web, and the edge
Harris revisits the SPA-vs-MPA argument through the lens of edge runtimes — and pushes back on the idea that SSR-everywhere is a victory for users.

Have Single-Page Apps Ruined the Web?
Rich Harris pushes back on the SPA-vs-MPA dichotomy and sketches transitional apps — server-rendered, JS-enhanced, and progressively interactive.

The Main Thread is Overworked & Underpaid
Surma makes the case that the web is the only platform that still pretends threads do not exist — and shows how to move work off the main thread with workers.

In The Loop
Jake Archibald walks through the browser event loop — tasks, microtasks, requestAnimationFrame, and the surprising ways the runtime interleaves your work with rendering.

The Cost of JavaScript
Addy Osmani breaks down what shipping a megabyte of JavaScript actually costs on real devices — parse, compile, execute, and everything in between.

Building a Custom React Renderer
Sophie Alpert builds a tiny React renderer live on stage, demystifying reconciliation by writing it from scratch.