I'm actually surprised that we had this in our code, as it seems like a huge
oversight, but we were individually loading each and every referenced contact
and host during domain/application create/update/allocate flows. Loading them
all as a single batch should reduce round trips to Datastore by a good deal,
thus improving performance.
We aren't giving up any transactional consistency in doing so and the only
potential downside I can think of is that we're always loading all contacts/
hosts instead of only some of them, in the rare case that one of the earlier
contacts/hosts is actually in pending delete (which allowed short-circuiting).
However, the gains from only making one round-trip should swamp the potential
losses in occasionally loading more data than is strictly necessary.
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