It's no secret that you need to minify your scripts and pass them along in a single request and put them at the bottom where they won't be blocking the UI to re

It's no secret that you need to minify your scripts and pass them along in a single request and put them at the bottom where they won't be blocking the UI to render. You should also link to CDN's to avoid that costly lookup or wait for the HTTP request hit (which is just so much larger when you're talking about it coming from the server (hopefully its light JSON and not a beast riddled with server-side templates. Bustle is an example used by Tom Dale, and their js app is what? Not even 150kb? your headers alone are probably slowing you much more than this. Locking the UI is bad, but it's not all JS apps that lock up the page as the browser puts it all together. You just need to know how the browser reads your styles and scripts and put them in the right place.