Before proceeding to eventually learn the modern SQL finally and write a couple of stored procedures to stop pumping terabytes of almost-raw data to your "application server" code to be filtered by ORM that is too complex to understand, and in the same time still too stupid to use half of the features your DBMS provides.

You're complaining about a scenario where you might have picked an ORM that didn't met your personal performance requirements. Even if you ignore that you are free to pick any ORM you choose and even if you assume that you have all the time in the world to refactor your project to an experimental setup that was never tested at all, your comment still sounds like a revamp of the old argument on how hand-rolled assembly is always superior to any compiled or interpreted code.

Actually many ORMs are way too complex and if you only need 3 selects + 2 inserts than yes avoid the ORM.