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What are some of FreeBSD's improvements, apart from multithreading?

VIMAGE / VNET, which allow you to have an instance of pf for each jail. Very useful

The MT work is important, don't be so ready to dismiss it. There has also been work on speeding up pf outside of the MT work.

I'm just not sure how significant the MT work is. OpenBSD's pf has also had performance improvements since 4.5; it would be good to see a benchmark.