I started using FreeBSD 26 years ago when I worked for Sendmail, who had a couple of core committers on staff or staff-adjacent. Back then the refrain was "it can't do nearly as much as Linux, but what it does do it's much better than Linux".
And specifically it was known that if you wanted the best possible networking stack, FreeBSD was the choice to make (And also why Netflix uses it, for the networking stack).
All this to say, is it true that Linux now has better network performance, or did you mistype that?