Speed of V155 on mobile phone with responsive template

I have installed a clean version of zencart V1.5.5, then I have migrate the products from an old oscommerce website to this zencart.
I have speed problems with the responsive classic template (same problems with the responsive sheffield blue template from Anne that I would like to use).

Everything works fine on a desktop but on a mobile phone (I have tried several) it takes 15 seconds or more before the website loads. And a strange thing happens when you are on a product_info page: below the bottom banner comes a completely out folded category tree?

I have 6000 categories (and sub, subsub, subsubsub) and a total of 19.000 products and I use a fast VPS server with the PHP 5.4.45 and mySQL 5.5.47. When I use the classic green template the website loads lighting fast on a mobile phone and desktop but is ofcourse not responsive and that was the reason in the beginning to use this V1.5.5....

Anyone with the same problem or a solution?

In the debug log files I find this:

[29-Apr-2016 10:29:46 UTC] Request URI: /admin/configuration.php?gID=31&cID=547, IP address: 212.178.68.158
#1  call_user_func() called at [/home/admin/web/testsite/public_html/admin/includes/functions/general.php:1800]
#2  zen_call_function() called at [/home/admin/web/testsite/public_html/admin/configuration.php:129]

No idea what that means but it is only in the admin?
(I have changed the admin folder and website).

The testsite IP: http://188.165.164.57/

Please enable in your admin > config > logging > Display The Page Parse Time > true
Then the output from that can be used to help diagnose what problems may be occurring. https://www.zen-cart.com/content.php?145-what-do-the-page-parse-times-and-query-counts-numbers-mean

Desktop using responsive classic template: Parse Time: 0.371 - Number of Queries: 112 - Query Time: 0.099326187316895
Mobile using responsive classic template: Parse Time: 0.313 - Number of Queries: 113 - Query Time: 0.028788127120972
Very strange because on a mobile Phone the site shows up after about 15 seconds?

Desktop using classic contemporary green: Parse Time: 0.156 - Number of Queries: 98 - Query Time: 0.087388568313599
Mobile using classic contemporary green: Parse Time: 0.201 - Number of Queries: 108 - Query Time: 0.08323220539856
On a mobile Phone the site shows up immediately using the classic contemporary green template?

Very strange because on a mobile Phone the site shows up after about 15 seconds?
Are you using wi-fi with your phone??

kobra:

Are you using wi-fi with your phone??

I use WIFI and 4G on all phones, most of the time the WIFI (from my home connection) is faster...

There is a difference between the classic template and the responsive templates (i have tried responsive sheffield blue too). The problem seems to be the categories in the menu. I have disabled the categories and the site is lighting fast on desktop and Phone.

You can look: ```
http://188.165.164.57/

There are also other strange things: the language menu does not show up in the Phone version and the all products does not function, that is you don't see products.

Quartier:

Everything works fine on a desktop but on a mobile phone (I have tried several) it takes 15 seconds or more before the website loads. And a strange thing happens when you are on a product_info page: below the bottom banner comes a completely out folded category tree?

I have 6000 categories (and sub, subsub, subsubsub) and a total of 19.000 products and I use a fast VPS server with the PHP 5.4.45 and mySQL 5.5.47. When I use the classic green template the website loads lighting fast on a mobile phone and desktop

Quartier:

There is a difference between the classic template and the responsive templates (i have tried responsive sheffield blue too). The problem seems to be the categories in the menu. I have disabled the categories and the site is lighting fast on desktop and Phone.
Yes, the mmenu included with the responsive_classic will surely slow mobile loads with that amount of categories.