I am going to focus on https://pereezd01.ru/, the other URL has mixed content that could be causing other issues.
For https://pereezd01.ru/, this is a JavaScript issue of some type, slideshow loading is being delayed by another script on the page, possibly jQuery loading too slowly.
Aside from plugin conflicts, this could also be a theme conflict, or a content issue, with an ad or analytic script. I am running much larger slideshows on SSL success fully, so it is possible.
I see one missing URL error, that is the first thing I would try to resolve:
https://www.yell.ru/yellrank/yellrank.js/?cmp=6570799
The most likely issue is a script from third party domain is loading slowly over HTTPS, and that is slowing the whole page down, causing the slideshow script to delay loading. Any scripts that you can remove, minify, move to the footer, or bring internally rather than a third party could speed up the over all site and resolve the conflict.