Significant smaller headers means significant smaller requests. That allows the client to inform the server in a shorter time more comprehensively which set of

Significant smaller headers means significant smaller requests. That allows the client to inform the server in a shorter time more comprehensively which set of files are needed. Especially in the mobile use case where bandwidth in the up-link is limited and the channel is not always stable this may really improve user perceived performance. I don't worry about compression effort too much - deflate has been used for a long time.