debdelta
So I installed Fedora 17 in a VM and noticed presto does a pretty good job of reducing the need for downloading updated rpms. Debian do something similar with pdiffs for package list updates, and there's debdelta-upgrade for downloading deb deltas.
Why does Ubuntu not have this yet?
There was some work done in 2011: https://wiki.ubuntu.com/UbuntuDebdeltaSupport but the linked UDS meeting page is 404: http://summit.ubuntu.com/uds-o/meeti...ns-o-debdelta/
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