Revisions are slow to land in new package lists

As a Hackage trustee, I frequently use [`hackage-cli`](https://github.com/hackage-trustees/hackage-cli) to upload multiple revisions to Hackage. Usually I want to update my package list after the upload and check whether there are any bad build plans left for the package I'm interested in.

The problem is that the next `cabal update` never includes all the revisions I have just uploaded. It usually takes multiple minutes until `cabal update` finds a fully up-to-date package list.

So I'm wondering whether this process of updating the package list could be sped up a bit. I think it should ideally not take much more than 10s or so.