Based on the manual, you're right about the lowdelay stuff. I guess it depends on how you design your queues. I usually put stuff that performs badly under congestion (like voip) in its own high-priority queue. Anyway, you can see how (and if) your queues perform by installing pftop and pressing '8' after starting it (you can also use pfctl -sq -vv, but that's less granular and harder to read).
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