It takes thousands of simultaneous connections to get to that point, if you're seeing that, you have that many connections through reflection. We generally advise against using reflection at all, but it's a fine solution in most circumstances, just not when you get to higher numbers of connections that need to be reflected. High throughput environments do it "right", i.e. split DNS.
Efonne does have a branch in git that does reflection in pf, which gets rid of the nc scalability issues. That's for 2.0 only, and may have other drawbacks as it hasn't been nearly as widely tested.