ORM for large projects?

Question

ORM

I wonder how the architecture of the back-end of huge projects is built, say from 100,000 uniques per day?
Of course, I read about possible ORMs
https://en.wikipedia.org/wiki/List_of_object-relat...
https://www.gajotres.net/best-available-php-orm-li...
https:// stackoverflow.com/questions/108699/good-ph...
However, I think that there is something of my own, or not? Are there any examples of Eloquent ORM under such load? What is Facebook using?

Answer 1

used, but not for everything))
that ends with profiling, begins with replacing the code with raw sql

Answer 2

https://www.insight-it.ru/highload/2010/arkhitektu...