There wasn't an internet connection involved in the tests shown. The tests were local ethernet only only. The LAN connection involved a switch, but the pfSense to DMZ host latency is literally just over a cross connect. No bridging was involved in the graphs I posted, but for what it's worth, I've also tested in a bridged LAN setup and it appears to have no impact, positive or negative. The distro of Linux is Gentoo. Over the course of several weeks other tests were run to individually check latency of the various components involved, switch, mulitple hosts, etc. The sawtooth with pfSense was consistent throughout.