Learn advanced JavaScript performance optimization techniques in this 55-minute conference talk that draws from over a decade of experience building the excalibur.js game engine for the web. Discover how to demystify browser performance tools in Chrome and Firefox, optimize slow functions, identify and prevent memory leaks, cache expensive computations, and prevent performance regressions. Explore when and how to effectively use WebWorkers, WebAssembly (WASM), WebGPU, and TypedArrays to maximize JavaScript performance. Master practical optimization strategies that apply not only to game development but also to building large-scale web applications, with techniques you can implement immediately to dramatically improve your application's speed and efficiency.