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I'm guessing one addon listened for events in the combat log and the other one from UNIT_AURA event instead. From what I can recall, combat log events were faster than UNIT_AURA back when WoW still had something called spell batching (removed in Warlords of Draenor). Nowadays they should be the same.
For WeakAuras I think aura scans are throttled but there definitely shouldn't be as much as ~0.5s delay.
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