I looked into this a bit for classic Macs (8MHz 68000), and found that they didn't have the computing power to complete a handshake before the timeout was up. I could be wrong though, and maybe some faster implementation is possible...
We'll need to build new network cards with hardware accelerators.
And be back to the stage where the most powerful computer in the office was a peripheral (back then we had a printer with more memory than all our Macs combined and a flashy AMD 29K CPU)