[zub]

> I can't see a way that new protocols are going to solve this, unless I'm missing something in how HTTP2 is going to be handled by the browser?

HTTP/2 server push. Your server can proactively deliver things like rollover state graphics knowing that the client will need them.

[robbles]

good point. I imagine determining when to push these assets will become a complex choice though.

Also, I realized shortly after commenting that I missed the obvious benefit of avoiding downloading global spritesheets and other compiled assets for individual pages that only use a subset of the content.