Currently there is nothing in the database to differentiate mob attack speed. You might be able to increase their attack speed if they have a haste item as part of their loot table, but even then I'm not certain. About the only surefire method is have them cast a self haste buff.
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<idleRPG> Rogean ate a plate of discounted, day-old sushi. This terrible calamity has slowed them 0 days, 15:13:51 from level 48.
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