Actually there are several mobs with < 1 second delays. Several Vex Thal bosses do. Aten is the fastest I've seen at 0.6. Sony balanced the slowable Luclin bosses by giving them very fast attack delays. This was before slow mitigation, so it was their way to make sure slowed raid bosses weren't super gimp like in Velious.
Basically anything that makes an NPC 'begin to cast a spell' will make the attack timer more erratic, regardless of cast time. Again, it doesn't reduce the total number of rounds over time, (unless the cast times are long) just makes them sort of bunch together more.
It's easy to see in the logs when double rounds occur and there are upwards of 8 attacks in the same log second. Mobs like Aten are accurately measurable by slowing them and dividing by 4.
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