How does the site work from the inside (deep technical analysis of the site)?

Question

PHP

Good afternoon.
A question regarding in-depth analysis of the site.
Suppose when I enter some page, I see in the inspector that the server responded in 2 seconds.
I would like to understand what exactly the server was busy with for 2 seconds.
What php scripts worked? What were they busy with? how long did it take them? how many queries were sent to the database? to kami tables, etc.

Tell me, is there any tool for this kind of analysis?
I must say right away that we do not use CMS and a framework that has such capabilities.

Answer 1

If we are talking about an arbitrary site, then it is impossible to do this without hacking.
If we are talking about our own site, then this is done at the development stage and any developer is familiar with debugging and profiling tools

Answer 2

Xhprof is here to help.