The article discusses how WebAssembly (Wasm) can enhance performance for CPU-intensive tasks in web apps compared to JavaScript. It provides a step-by-step guide on compiling a C function to WebAssembly using Emscripten for tasks like determining prime numbers. By leveraging WebAssembly, developers can significantly improve the speed of computations such as heavy mathematical operations, real-time audio/video processing, and image manipulation in web applications.