Why scripts are loaded with a delay?

Question

Python

I use the template limitless demo.interface.club/limitless/layout_2/LTR/default... , and noticed such a thing that scripts are loaded with a delay of about half a second. For example, in the menu, hidden items first appear when the page is loaded, and immediately disappear and everything is fine. Pts ugly :( well, it’s like this everywhere, for example, styling the input file, the default one is loaded first, and after half a second everything is fine.
The site is on Laravel, the scripts are connected like this:

<script type="text/javascript" src="{{ asset('/js/core/libraries/bootstrap.min.js') }}"></script>

and so on,
can anyone advise? maybe someone came across

Answer 1

At least Lutz's "Learning Python" up to chapter 37, the entire Django manual and Asyncio documentation.