How can there be different speed of page load two identical sites?

Good afternoon. This problem. Developed a website on Bitrix. After the development moved it from domain to domain. And the site started to work very slowly. The sites were both on the hosting. Hosting place very much. Hosting settings for the Wallpaper sites are the same. Can't understand what could be the problem. And yet I noticed that
on the domain where the site is loaded quickly, in the developer tools loaded images only on the page where I am.

And in the domain where the website is slow, all pages loaded all the pictures from around the site.
March 12th 20 at 07:58
1 answer
March 12th 20 at 08:00
You only credit agreement to writing)

Developed a website on Bitrix. After the development moved it from domain to domain. And the site started to work very slowly. Sites both remained at the hosting
At what point do they become two?

from domain to domain
Thus the site remained in place, only added to his alias domain? And so they became two?

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