I've got a Protectli VP2420 running OPNSense at home, which has 4x Intel i225-V 2.5gbe running on a weaker Celeron J6412, and I was able to get the expected iperf performance of ~2.35gbps from some brief testing between two directly connected machines. I didn't really do any deeper testing than that though, and I'm not currently doing any crazy threat detection stuff.