Improve asyncio transport/protocol performance

[tarasko]

Hi @Kludex,

Would you be interested in trying out aiofastnet?
It provides very efficient drop-in C/Cython re-implementation for loop.create_server.
Perhaps as an optional extra?

I did it for an algorithmic trading project because both asyncio and uvloop transport implementations are quite far from optimal (especially TLS layer), they have a lot of python plumbing and memory copying, and transport latency was crucial.

I also made a websockets benchmark recently with some curious results, it shed some light on the actual performance of websockets, aiohttp, and others.