Why does the site take so long to load? The main stone is document?

Question

Server optimization

There is actually a website . Loads terribly long even with caching. It's clear that there are a lot of scripts, but that's why this is observed:

Here is what the devtools shows:

I.e. exactly the first request is so long. There are 18 requests on the main database, like, i.e. the base does not suffer

Answer 1

Create an empty hello world page and see how long it takes to load.
Next, gradually turn on the javascript, and only then the database. So in 5-7 iterations, find out where it slows down.

Answer 2

I would like to add that 5MB per page is kind of overkill.