[snitko]

Embedding css into a webpage forces this css to be loaded every time. Even if the css only contains what's needed for the page, it can still be a lot. Caching it is just common sense. I think if you try and calculate, there will be a lot of bandwidth saved if you separate css into a file.

[ricardobeat]

Not true. The CSS is inlined as strings in the js file, and benefits from caching just as much as the rest of your templates (this is for single-page apps).