Support for WebAssembly in Vercel Edge Functions enables developers to compile and run their applications with languages like Rust, Go, C, and more. This simplifies the process of building at the edge without requiring complicated setup or changes to workflow. WebAssembly allows developers to take existing libraries written in different languages and use them directly in Edge Functions, making it possible to reuse code across languages. By recompiling dependencies to Wasm, developers can potentially move serverless functions from JavaScript to Edge Functions, especially for computationally heavy tasks like encoding and decoding binary data. The compilation of WebAssembly is often faster than the same code in JavaScript, with a potential speedup of 2-3 times for computationally heavy workloads. This enables developers to write idiomatic code in their chosen language and run it on the Edge, resulting in improved performance and efficiency.