[Define New Theme] 9. The css/js that is served and cached should be minified/compressed/gzipped.

[MattF]

IMO we should do most of those! but server-side and only on compile time.

I was thinking the other day... isn't there any server-side way to dynamically combine all the required .css files into one file and then serve it?

yeah..no! That's what phpBB 3.0 did, and it was bad, and thankfully removed from 3.1.

CSS/JS should be served up as-is, already minified/concatenated, right form the server.

How it gets minified/concatenated will up to the developers.

[callumacrae]

IMO we should do most of those! but server-side and only on compile time.

I was thinking the other day... isn't there any server-side way to dynamically combine all the required .css files into one file and then serve it?

There are libraries like assetic, but they're pretty terrible.

I've said it many times before, I'll say it again: I've never used a front-end tool written by a backend developer and liked it.