1) it is a pleasure (and a honor) to see so many clever answers coming to help the poor beggar in the slumps.
See previous post "I AM TERRIFIED : MOODLE IS VERY SLOW !"
2) as I have installed a lot of sites as a professional, all of them starting on a local XAMPP, I noticed immediately the fact that "MOODLE is very slow" in this configuration.
3) my company requests "very fast responsiveness" to 60 000 up to 600 000 students.
And Admins and Professors must work also very fast.
I have full responsibility on this achievement.
4) I need to build a production site "hyper-fast, simple, non-explosive".
Any architecture, any database, any technology, BUT open source, and everything "on our servers".
While i am studying HERE, thanks for your advices.