Why does the server response take a long time when analyzing through Webmaster?

Question

CMS

Without much prelude, let's get straight to the point.
There is a blog on CMS Wordpress - khatsker.site
The speed of its work is amazing. The main Yandex robot shows that the server response time is 50 ms, and the site itself loads quite quickly on the phone (I have plugins for caching and lazy load).

Even PageSpeed ​​Insights, which constantly swears, shows that everything is great. Giving out the mobile version of the site 99 points out of 100

It would seem that everything is fine. But the Webmaster complains that "when accessing the pages of the site, the average server response time exceeds 3 seconds."

How so? I just don't understand how this is possible!

Answer 1

because average time != minimum time. you have the main 150ms, and let's say https://khatsker.site/verit-otzyvam/ 19 seconds. 19 seconds Carl!
profile.
you are all so sure that you have enabled the cache and everything will be fine. ah, no! caching efficiency is never 100%, sooner or later you will miss the cache.