What is the minimum possible response time for ssl+nginx+php?

Question

PHP

Yandex.Cloud is running Ubuntu 18.04 + Nginx(1.14) + Ssl(certbot) + Php7.2-fpm, response times are as follows:
Testing from a host with a web server via curl -s -w
http: 5ms
https: 15ms
https -> php : 25ms
https -> php -> pgsql: 38ms (db on another host, so omit)
I think this is too long

The question is: how much response time can I squeeze? What is it like for highload services and how to make it like that?
PS configs are all standard, php via fpm

Answer 1

It is important to understand - why squeeze. 30, 50 and even 200 ms to load a page in the browser are barely distinguishable (or rather, the spread from packet loss and RTT of the client's Internet makes a much larger contribution).
If you keep the response time for the vast majority of requests comfortable for the user under the calculated load during load testing - congratulations, you are doing well. If not, this is where the field for optimizations will be found.