WebAssembly demonstrates significant performance advantages over JavaScript for computationally intensive tasks. A practical comparison using a browser-based image processor built with Rust shows Wasm running approximately 2x faster for lightweight operations (grayscale conversion) and over 6x faster for heavy processing (sharpen filter with convolution matrix). The tutorial walks through building the image processor using Rust, wasm-pack, and wasm-bindgen, implementing both light and heavy image processing tasks, and measuring performance using the performance.now() API. While JavaScript remains optimal for DOM manipulation and UI logic, WebAssembly proves to be the better partner for heavy data processing in modern browsers.
Table of contents
Introduction to the Wasm vs. JS TutorialBuilding the Image Processor With Wasm and JavaScriptCompiling Rust Code into WebAssemblySetting Up the HTML FrontendHow to Run the Performance TestPerformance Comparison ResultsSort: