Comment 28 for bug 570805

10.04.1 candidate images are not yet available.

I did, however, measure the performance difference on a running system.

 1) Install Ubuntu 10.04 Server
 2) sudo apt-get update
 3) sudo apt-get dist-upgrade --download-only
     (32 updates available now)
 4) time sudo apt-get dist-upgrade
      takes 3m33s

Then:
 1) Install Ubuntu 10.04 Server
 2) Upgrade dpkg to -proposed
 3) sudo apt-get update
 4) sudo apt-get dist-upgrade --download-only
     (32 updates available now)
 5) time sudo apt-get dist-upgrade
      takes 1m52s

There's clearly a huge performance improvement. I would like to see this promoted from -proposed to -updates, and would very much like to test this on a real ISO whenever that's available.