I have a problem using ScrollMagic to do parallax scrolling: When scrolling, the background images are jerky instead of scrolling smoothly. The site in question is this: https://camilledevillers.fr/site.html
I have noted the problem on all the browsers I have tested (Chrome, Opera, Firefox, Safari). I also found that with a powerful PC (Ryzen 7 2700x), it did it less than on my i3 laptop (but still a little).
Where can the problem come from? Are the images too "big" for ScrollMagic who has trouble doing the calculations? ScrollMagic itself which is not optimized enough? (However, I have seen websites that work very well with it...)
In short, I don't find the reason for these jerks.