What determines the server response time?

Question

Apache HTTP Server

What determines the server response time?
From the hoster itself, database configuration, web server configuration and lack of resources, lack of caching?
Does the server response depend on layout?
If the site on the WordPress engine is on a shared hosting, then the server response time of 1.1s is normal or not? Measured on Google PageSpeed

Answer 1

It can depend on anything, including the total.
Even on which and how many modules are activated and how they are configured on the site, and ending with all sorts of side settings - MySQL DBMS, what type of table, what version of PHP, etc. etc.
In short, there is no clear answer.
More than 1 s is too much. But is this already a given page? Or generation time on the server?
However, for Wordpress, I thought here, this is quite a normal situation.

Answer 2

I measure the response time of the server in Google PageSpeed ​​- it shows 1.1s. This is how I understand the content loading time?
And I measure TTFB using Netpeak Spider - it shows 198ms.
Are these normal readings?
In general, is the server response time normal for this site or not?
Leave everything as it is or need more optimization?