How can I improve load performance of Angular2 apps?

Question

Angular2 app is loading slow, how can I improve the performance on load?

I use Angular2, typescript with html5.

currently my app takes 4 seconds to load. I h

Answer 1

because its SPA and angular 2 init too slow. thats it. plus RXjs, tons of polifills etc. AOT can help but a lot of angular2 libs do not work with it. angular universal realy helps