PPPoE performance with current setup

[mattuz]

Hello everyone I have a Lenovo Tiny m910q with I3-7100T and 4GB of RAM. I installed via pci-e a x4 nics rtl8125 card.
In the next month my local isp will hook up fiber optic with up to 2.5GB speed, and I'm getting ready all the hardware.

I started doing some lcoal test and iperf3 between opnsense and a pc results 2.37Gbit/s that seem ok. But using the same pc with linux and creating a PPPoE server is giving awful performance, I cannot get it past 500Mbit/s even with all the optimization recommanded online.

I tried two different pc for the PPPoE server to make sure it wasn't this side bootlenecking (even on a ryzen 9) but I can't get it past that limit. Looking at opnsense host cpu usage during the test it doesn't go over 30% so I don't really get it...

Unfortunatly I do not have any other scenario to test.. I would like to get your input it what might be the cause of this... I would like to get this Lenovo Tiny (opnsense host) to be 2.5GB capable as soon as the connectivity is hooked up