I have the website link with two sliders on the homepage. The first and main (which should be seen when loading the page) takes a long time to load. Debugging with the chrome tool, I see that images always load long after the second one (which is much lower and is secondary).
I have tried several configuration options (in the Lazy load of the SEO settings of the Slider) with negative results. The other option would be to implement it by code using resource hits (preload and prefecht) but it is automatic in wordpress and today I do not know plugin that allows you to select widgets one by one and adjust preload, prefecht, preconnect, etc.