Is speeding up apps an aim of WebAssembly? I’m not being sarcastic… most of the slowdown you see in webapps is due to the DOM and/or network latency and WebAssembly offers nothing new there. The JavaScript language is very rarely the reason why an app is slow.

I’ve used WebAssembly to great success creating a unified codebase that runs on Node, an iOS app and on the web. It’s a niche but in that area it opens doors that were previously impossible to open.