Hi @marijn ??
Would you mind sending through a link to the site so I could have a look for you? It sounds like what we call FOUC (flash of unstyled content) as the site is loading scripts and things. It will vary from what browser is being used (some are more resource heavy then others) and what internet connection the user is on.
I can run the site through gtmetrix to see if we can make any suggestions on how to speed this up (sending through cropped images etc) but a lot of times the amount of plugins and if you are using a bloated theme can also affect page load times as well.
You can always try to use a custom javascript to fade in the slider after the page is loaded.
This is just an example and would need to be changed based on the slider ID but this would give you an idea of what I’m referring to.
jQuery(window).bind("load", function() {
jQuery('#soliloquy-container-998').hide().fadeIn(5000);
});
In any case, I’m happy to investigate this further for you if you could send through a link ??
Please let me know how I can help! ??
Thanks