Website flickering on loading

Hey Ralf,
Thank you for your patience and the video and link, this looks like a lazyload error to me based on similar loading issues that I have seen on other sites. When I have seen this before it was not the expected behavior or the correct behavior, it was more like a conflict. I note that you are using a plugin called PhastPress that I have not heard of before and when I research it I find that it seems to be a “no configuration” web page optimization engine with lazyloading, so my first suggestion would be to disable it to see if you continue to have this issue.
The script looks like it waits for the DOM to load and then passes the theme scripts and css phast.on(document,"DOMContentLoaded").then which might be causing an issue with page load functions resulting in a double load with some elements, but I’m not sure.
If you find the page loads correctly without the plugin, but you want to try to keep using the plugin, you could try disabling the theme lazyloading and ensure the jQuery is not being forced to the footer at Enfold Theme Options > Performance > Load jQuery in your footer and disable Enfold Theme Options > Performance > JS & CSS file merging and compression, although I don’t believe you are using this. Also try disabling any other caching, I can’t see if you are using any, and also try disabling server cache if it is an object-oriented cache such as Memcached, Redis, Varnish, Litespeed, etc.
I hope this helps.

Best regards,
Mike

Hi,
Glad we were able to help, we will close this now. Thank you for using Enfold.

For your information, you can take a look at Enfold documentation here
For any other questions or issues, feel free to start new threads in the Enfold forum and we will gladly try to help you :)

Best regards,
Mike