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Hello, we have an issue on our website: www.ozdobnepolstare.cz - Time to first byte is too slow (about 7 seconds, sometimes longer...). 

 

Server info: http://ozdobnepolstare.cz/php/php.php

 

Cache in configuration is ON.

 

Can somebody help us? 

 

Thank you for reply

 

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Server information:

Linux wl61-wv5 2.6.32-573.7.1.el6.x86_64

#1 SMP Tue Sep 22 22:00:00

UTC 2015 x86_64

PHP version: 5.4.45

Memory limit: 128M

Max execution time: 90

 

Database information:

MySQL version: 5.6.17

MySQL engine: InnoDB

Tables prefix: nvct_

Store information

PrestaShop version: 1.6.1.9

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That's your PHP and DB information.

 

I'm asking about the server, that is amount of RAM, type of processor, SSDs etc.

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  • Shared hosting

2x procesor Intel Xeon E5-2650 v2, 10C/20T 1.70GHz 25MB

384 GB RAM DDR3

4x SATA 1 TB, 8x SSD 800GB, RAID 1 or RAID 6

OS Linux CentOS 7

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It's multistore with 5 shops and on main shop (originalzfilmu.cz) we resized images, but issue still persists. Problem is First time byte (about 5-7 seconds - in some cases we see 25 seconds) what you can see for yourself, when you try go to the shop.

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This suggests that TTFB is OK for individual assests

 

https://tools.keycdn.com/performance?url=http://www.ozdobnepolstare.cz/modules/homesliderpro/images/resize_Chanel.png

 

I think therefore that other things on your site are causing the issue

 

Again. are all your "performance" settings on?

Try switching off all third party modules to try to narrow it down

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You should upgrade your php version. PHP 5.4 is no longer supported and unsecure. PHP 7 is much faster.

You could try a local install with php 7 first.

 

What kind of cache is activated ? "file system"? As to my experience caching in file system may cause massive delays in loading time sometimes. If your server doesn't support other cache methods it's sometimes better not to activate cache at all. You could try prestaspeed from codecanyon.

 

And as mentioned before your slider images are way too big! Your slider images "weigh" 7 x 700KB = 4,9MB(!!!)
png is not the right file format for slider images. Use jpg instead and compress them until they are not more than max. 100KB each.

Edited by prestamax (see edit history)

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Thanks all for replies. Problem was solved when I updated Prestashop to version 1.6.1.12.

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