Solution, for all who will face this problem in the future.. Ciaran modified file styles.php and remove section below.

background-image: url(data:image/svg+xml;base64,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); /* gradient overlay */

background-image: -moz-linear-gradient(left, rgba(0,0,0,.15) 0%, rgba(255,253,253,.15) 50%, rgba(0,0,0,.15) 100%); /* gradient overlay */

background-image: -o-linear-gradient(left, rgba(0,0,0,.15) 0%, rgba(255,253,253,.15) 50%, rgba(0,0,0,.15) 100%); /* gradient overlay */

background-image: -webkit-linear-gradient(left, rgba(0,0,0,.15) 0%, rgba(255,253,253,.15) 50%, rgba(0,0,0,.15) 100%); /* gradient overlay */

background-image: linear-gradient(left, rgba(0,0,0,.15) 0%, rgba(255,253,253,.15) 50%, rgba(0,0,0,.15) 100%); /* gradient overlay */

Thanks Ciaran!

Hi Michal

May I suggest sending temporary administration access to your Joomla installation to info@joomla51.com and we will disable some of the more CPU hungry scripts from your template. For our reference please paste a link to this post in your email.

Ciaran

Hi Ciaran,

Does the issue resolve itself if you temporarily disable all modules?

- Yes, if I disable all modules issue still occurs

Is the issue present if you enable one of the default Joomla templates (Protostar)?

- No, If I set Protostar as default template, it is ok. Site scroll properly

Cheers
Michal

Hi Michal

Does the issue resolve itself if you temporarily disable all modules? Is the issue present if you enable one of the default Joomla templates (Protostar)?

Ciaran

Hi Ciaran,


scrolling the page is jamming in both mouse scroll and scroll bar. I also noticed in chrome task manager that during scrolling page tab utilize processor is very high. This situation is only on this site, I did many things with cache etc, for now nothing helped. I also ask hosting provider to check it and consultant told me that he also has the same problem with this site.

Additionaly I checked site using sitecheck.sucuri.net and app.webinspector.com, site is clear, not infected.

Cheers
Michal

Hello

Could you please detail the scrolling issue you are having. We have checked your site in Chrome and unable to notice any issues.

Ciaran