300x if it is true you will be just busy dealing with you customers rather than pitching here. Also since it is a vibe coded project, if you are really that good , you should even need to related yourself with Postgres. Who will want related itself to something that is 300x slower than itself?
You use stability of PostgreSQL to open a pitch. Also most people use PostgreSQL because someone out there was a fan, proponent and champion of Postgres. Otherwise they'd be on MySQL or Oracle.
And your sales folks would call and say: "No need to change anything, we still run PostgreSQL, and ours is just called pgrust, but it's N times as fast".