Who can help to live, or slow internet and large packages

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https://bbs.archlinux.org – I have slow internet(mobile gprs 10 kBytes/s). Updating packages like "kde-wallpapers" or "kdeartwork-wallpapers" take a long time despite the fact that the contents of the package no major changes. If you do a binary diff, for example on the "oxygen-icons" you can only download about ~300 kilobytes. Can support in the pacman binary diffs of packages, and on the server generating diff`s of these files by utility xdelta3? Or make it a separate utility (such as yaourt) which will download the differences and generate packets, and pacman will install it.Who now cant (HowTos)