791: LLRT The Serverless Runtime w/ Richard Davison

791: LLRT The Serverless Runtime w/ Richard Davison

Scott and Wes chat with Richard Davison from AWS about LLRT, a new runtime tailored specifically for Lambda. They dive into the benefits of using LLRT, challenges with JavaScript in serverless, and why Rust was chosen for its development. Show Notes 00:00 Welcome to Syntax! 01:07 Who is Richard Davison? 05:11 What is LLRT and what’s the motivation for building it? 08:25 AWS Lambda example. 11:20 What makes LLRT specifically tailored to Lambda? 14:55 Brought to you by Sentry.io. 15:22 Node.js in Lambda. 16:00 What are some challenges that people have with JavaScript in serverless? 17:20 Lambda memory configuration. 19:23 Managing cost of compute. 21:29 Simpler and faster than Node, Bun, Dino, but not a replacement. 22:31 The benchmarks. 27:00 Quick.js, the main reason for the performance gains. Fabrice Bellard QuickJS. 28:03 The Quick.js engine. 30:35 What was the reason behind creating Quick.js? 33:46 What made you pick Rust for LLRT? 36:34 Abstractions and the value of speed. 39:08 The JIT Compiler. 42:38 Compile cache. 43:27 De-optimizations. 44:59 Node.js Compat, what to use and avoid with LLRT. GitHub AWS Labs Compatibility Chart. 47:52 Will you target with WinterCG spec? 50:22 Streams API. 52:06 What about WebSockets? 53:10 Is this going to be promoted from a labs project? 54:49 Sick Picks + Shameless Plugs. Sick Picks Richard: QuickJS Engine, JSLinux. Shameless Plugs Richard: Javascript Hit us up on Socials! Syntax: X Instagram Tiktok LinkedIn Threads Wes: X Instagram Tiktok LinkedIn Threads Scott: X Instagram Tiktok LinkedIn Threads Randy: X Instagram YouTube Threads

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972: These Things Make Your App Feel Like Crap on Mobile

972: These Things Make Your App Feel Like Crap on Mobile

Wes and Scott talk about why mobile web apps often feel “janky” compared to native—and how to fix it. They cover input zooming, accidental horizontal scroll, pointer/user-select quirks, frame rate con...

21 Jan 38min

971: Stackoverflow and Firefox are Dead?

971: Stackoverflow and Firefox are Dead?

Is Stack Overflow actually dying, and what does that mean in an AI-driven dev world? Scott and Wes break down the latest web dev news, from Firefox’s AI crossroads and Apple’s browser engine changes t...

19 Jan 46min

970: Why Did Anthropic Buy Bun?

970: Why Did Anthropic Buy Bun?

Wes and Scott answer your questions about whether Git GUIs beat the terminal, balancing accessibility with experimental web projects, blocking malicious traffic, smart home setups, why Anthropic bough...

14 Jan 45min

969: This guy is nuts (TypeScript Doom)

969: This guy is nuts (TypeScript Doom)

Scott and Wes sit down with Dimitri Mitropoulos to explore the wild edges of TypeScript—from running Doom in the type system to building tools like Typeslayer. They dig into Turing-complete types, per...

12 Jan 55min

968: Habits and Changes We Want to Make in 2026

968: Habits and Changes We Want to Make in 2026

Wes and Scott talk about setting realistic goals for the new year, building habits through small, sustainable changes, creating systems that actually stick, and why incremental progress beats big reso...

7 Jan 33min

967: What’s Going to Happen in Web Dev During 2026

967: What’s Going to Happen in Web Dev During 2026

Wes and Scott talk about their bold predictions for web development in 2026, from WebGPU-powered design and modern CSS breakthroughs to JavaScript standards, AI-driven tooling, security risks, the fut...

31 Dec 202548min

966: A Look Back at Web Dev in 2025

966: A Look Back at Web Dev in 2025

Wes and Scott revisit their 2025 web development predictions, grading hits and misses across AI, browsers, frameworks, CSS, and tooling. From Temporal and AI coding agents to React, Vite, and vanilla ...

24 Dec 202556min

965: Baseline 2025 Features web gained in 2025

965: Baseline 2025 Features web gained in 2025

Scott and Wes break down the biggest web platform features that reached Baseline in 2025, separating the genuinely useful APIs from the niche and forgettable ones. From same-document view transitions ...

22 Dec 202526min

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