Reduce initial server response time

Hello, when I use PageSpeed Insights or Gtmetix or use Chrome and developer tools and make a Lighthouse to audit I see that there is a Reduce initial server response time.

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How to increase it? or maybe see if there is a problem on server side?

I use Cloudflare and RS server from Netcup.

The problem is not all the time but i see it in different times.

I would be grateful for any ideas how to check the website from server side.


I did not noticed it before, I was updating a centmin server and application too (to inscrese core vitats).
I run there ecommerce - Prestashop.

Code (Text):

cminfo
------------------------------------------------------------------
 Centmin Mod Quick Info:
------------------------------------------------------------------
Server Location Info
  city: Nuremberg
  region: Bavaria
  country: DE
  org: netcup GmbH
  timezone Europe/Berlin

Processors physical = 1, cores = 4, virtual = 4, hyperthreading = no

      4  1996.249
      4  AMD EPYC 7702P 64-Core Processor
      4  512 KB

 System Up Since:       2022-06-09 18:09:21
 System Uptime:         up 17 weeks, 3 days, 22 hours, 56 minutes
 MySQL Server Started   2022-09-30 12:32:21
 MySQL Uptime:          10 days 4 hours 33 min 30 sec
 MySQL Uptime (secs):   880410
 Server Type:           kvm
 CentOS Version:        7.9
 Centmin Mod:           124.00stable.s54
 Nginx PageSpeed:       OFF
 Nginx Version:         1.21.6 (031022-221318-centos7-kvm-f6624e7-br-6e975bc)
 PHP-FPM Version:       7.4.32
 MariaDB Version:       10.3.36
 CSF Firewall:          v14.17
 Memcached Server:      1.6.5
 NSD Version:            -
 Siege Version:         4.0.4
 Maldet Version:        not installed
 ClamAV Version:        not installed
 ElasticSearch:         not installed

Please advise which commanrds to run to check it to see if the problem is on server side.
I remember that VPS there were problems with performance, RS was more stable.
RS and VPS are type of VPS server in Netcup.

 

@eva2000 thank you for answer and links I am reading it.

Some of them I have implemented.

I am looking for some info about
Page Rules and, CF Workers (i.e. custom/advanced caching) etc.
CDN cache control, WAF, Firewall

May you or anyone share with me

I trying to find on forum some examples

Anyway I will be very grateful for any interesting link for reading and learing.

I have found some nice posts:

https://community.centminmod.com/th...dpress-and-xenforo-with-newrelic.22047/page-2

https://community.centminmod.com/threads/how-to-install-redis-server-on-centmin-mod-lemp-stack.4546/


@eva2000 or anyone
How to cache only not logged users?
As I understand that cache logged users could be danger? Am i right?
Or use any ajax to bypass it.
I am trying to understand it which method can be choosed.
Send different cookies on nginx side?
What are possiblites to manage guest and logged users.

Do you cache also logged users?

I is safe to cache ecommerce? Or just guesst and not-logged users. Problem with carts etc.

I am thinking how to bite the problem of cache of dynamic page for ecommerce where you have currencies, languages etc.
Is it possible to do that?

Thank you for your times and answers and any advises.
This forum is a repository of knowledge

 

@eva2000 Thank you for answer.
I am reading all links.

I just thinking how you or people deal with ecommerce websites.

Where you e.g 10 languaged and 5 currencies and or some attributs like size, color etc.

In the internet I did not find nothing regards prestashop. Completly nothing.
Maybe I will try find something regards Magento or Woocommerce.
I am thinking maybe to use java to read language or currency or ajax.

The topic is very interesting and hard. May you share how you or it is possible to deal with it?

It is a way more complicated then Wordpress and one language.

I would be vey grateful for any advises.

 

@eva2000 @deltahf thank you for all you resposnses.

This is very helpful info, now I know what I should learn and use.

May you share with any tutorials regards semgent 3?

I need to wait for new version of Prestashop where php 8.1 will be supported
Regards CPU I use RS server from Netcup.

I see that first I need to make some optimization regards Prestashop itself.
@deltahf may you recommenct any good server with fast CPU?

Right now I was looking for a server with good network too, but when pages will be cached, CPU is more important, right?

My current kind of VPS is

Code (Text):

16GB RAM
4CPU
320 GB SSD

Thank you thank you guys for everything.
I am trying to find something in the Internet but there is nothing there (or have no luck to find good resources).
You are my mentors
I am a begginer but over a years of being here I am learning.

 

Thank you @deltahf and @eva2000 first of all I am optimizing ecommerce itself.
There are a lot of mess, spaghetti code, then I will move to PHP 8.1 and check CF.
I know that eCommerce have dynamic pages, so I was thinking to implement there ajax or something which would read on client side. I need to read more and test it.

This is for learning and I am wondering if I will achieve it.

Regards Wordpress is there maybe any tutorial how to cache it on CF side or use workers or full cache page?
Wordpress would be much easier for learning and testing.