I’ve never seen a scroll related animation that I didn’t hate to some degree. I suspect that the issue is that I skim and scroll REALLY fast and the animations always break the feeling of the page being a real surface.

Apple is the worst offender. Some of their product pages make me physically uncomfortable like when you miscount the number of steps in a stair and step into empty air.

And it’s not that I’m sensitive to animations or motion in general. Video games are no problem at all even when the physics make no sense.

There’s something special about how good scrolling is on Apple’s trackpads and mobile screens which causes a really deep immersion for me. I have an Ubuntu desktop with an old school scroll wheel mouse and there the animations are just annoying but not uncomfortable.

I think the issue is that the parallax is choppy in your page. For whatever it's worth, I typically don't care much about parallax in itself but I thought the same thing about the scrolling not being smooth.