Bring it to the max with multipath ;) since you have already Freebsd, no need to throw those beautiful reliable thing's away, maybe just buy a second...third? Dirt-cheap 100MBit card:
The server has a second NIC, but the switch has no more free ports. I briefly thought of bonding, but stopped when I read that the switch would need to support it (which it almost certainly does not).
But my point was that for my requirements, 100MBit are actually sufficient and FreeBSD still is a good choice for me, I was just being snarky about it. (I do find it aesthetically displeasing, though, that my wifi is now faster than my wired network, but I can live with that.)
https://en.wikipedia.org/wiki/Multipath_TCP#Implementation