JavaScript Blazingly FAST! Lessons from a Game Engine | NDC Oslo 2025

Is your app slow? Don't blame JavaScript! It might be a problem between the chair and the keyboard... I've spent over a decade building a game engine for the web called excalibur.js, I've learned a ton of tricks and techniques to make JavaScript run BLAZINGLY fast. These learnings are broadly applicable to more than just games, they've been very useful in my day to day work building massive web applications for EdTech. You'll learn how to: Demystify the browser performance tools in Chrome & Firefox Optimize slow functions Identify and prevent memory leaks Cache expensive computations Prevent regressions And when to use WebWorkers, WASM, WebGPU, and TypedArrays You'll walk away with practical JavaScript optimization techniques you can apply RIGHT NOW!