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From: "Lutz Donnerhacke" <lutz@donnerhacke.de>
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Subject: AW: dummynet performance
Date: Thu, 9 Apr 2020 17:53:31 +0200
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> In my production environment there are many schedulers and pipes &
> queues belongs to this scheds.
> dummynet uses %90-100 percent of single cpu. (ie. 20 scheds, 30 pipes,
> 35 queues total. Each pipe has max 30-100Mbps)

If the perfomance issue is urgent, you may give netgraph (ng_car, =
ng_pipe) a try.