Really not sure what you're trying to say here, but - New network is UDP between its own servers (dedicated 1Gbps on every link except the Beijing one, but its fast enough, too), but then Bitcoin-P2P protocol between the servers and clients. Hopefully you're using Bitcoin 0.13+ so you'll be using compact blocks, which are generally more effecient than the old relay network protocol by a decent margin (plus I have some hacks to force compact block clients into low-latency mode). If you have a server which is particularly far from the nearest relay network server I'm happy to talk about setting up something that isnt Bitcoin-P2P, and am thinking about doing FIBRE-based peering (so UDP floods for block announce).

Nope, see https://github.com/bitcoinfibre/bitcoinfibre/commit/335f87424a60af1fc02bffb7c84e90b8e2eadeca which will fast-relay compact blocks out to peers within a few ms of receiving the block if either a) you're a segwit peer or b) segwit has not activated.

Ahh, I see the misunderstanding - nope, its only Bitcoin-P2P publicly for now.