Keep in mind though that if part of your loading time is parsing large amounts of JSON returned from your backend, this blocks the main thread and your loading bar will be stuck for that time.
Are there any implementations of a task queue using web workers? It would be cool to have something where you can just decorate a function to do it on the web worker's thread instead of have to manually write the postmessage and onmessage stuff and have a separate worker.js
