You are using Tornado wrong!

[stalkerg]

1. Classic ioloop base on yield and decorator - deprecated. It will be removed in Tornado6.
2. You should use async/await only for uvloop.
3. You should drop momoko and start to use asyncpg. (asyncpg much faster)

Please do not mislead. Tornado performance close to aiohttp.

[stalkerg]

Also, will be good if you run multiple servers, one server per core, it's a common way to run async frameworks.