How to perform Time To First Byte on Server faster?

[alwaysbusy]

Hello.

On my DirectAdmin Server with CentOS8 my technicians have already installed and configurated NGINX and Apache.

In Google Page Speed Insights i always get shown a Speed Index from 2-3 seconds, which is for my feeling really slow.

I tried it also already with a CDN, but the problem is still the same, because i have no big video sites. I have to 90% only simple HTML/PHP sites with a handful of optimized small pictures on it. Rest (around 10%) are wordpress sites, for affiliate marketing purposes.

Could memcached be a solution that the sites are getting faster delivered on the server? My technicians now mentioned something from Litespeed, but i have no clue from this.

Would be happy, if i can get some useful tips here, what i else can try on my server, that the speed index would get lower...

Thanks for your help!

Greets

 

[alwaysbusy]

My settings from the server: Nginx, Apache, and PHP handler is "PHP-FPM" without http2.

I had been reading now that http2 in combination with fastcgi_cache would lower down the Time To First Byte on Server. Can someone here confirm this?

Greets