Highly doubt it.

a) MongoDB was the fastest database I had ever tried for many types of use cases e.g. tuple updates and in general significantly faster than

b) This is a Go layer in front of PostgreSQL which is fast but not faster than a native C socket server.

I'm not sure it's really an apples to apples comparison. The big selling point of MongoDB is that it sort of just works out of the box with horizontal scaling while Postgres is much more immature in that area.

You could try running https://github.com/mongodb-labs/py-tpcc to get an estimate. However, that might not reflect how people actually use MongoDB since TPCC is focused on transactions as opposed to analytics.