Comment 2 for bug 1719333

One issue, addressed by the patch above, is that we're loading more attribute values than we need to in the legacy path. "show stack" completes in ~half the time with that patch.

However, that doesn't seem to be the whole issue. Even when doing "show output" (so we're only getting a single output value, which ought to be very quick depending on the value chosen), it's still taking a considerable amount of time (~1 minute in TripleO) just to load all of the attribute values.