The networking subsystem is probably the place where FreeBSD is most competitive with Linux.

Linux just supports so much more hardware capabilities and fancy ways of doing things (e.g. io_uring, bpf logic in kernel etc.) that an expertly setup and tuned Linux system will probably exceed the networking speed of FreeBSD and provide more features while doing so. I'm not a networking expert by any means but this is what my understanding is.

I use FreeBSD for mostly for taste and the other reasons I outlined in my detailed answer above even though Linux is superior performance wise.