Problem regarding parallex

I have parallex effect on one image but when I preview the website, the parallex effect looks bumpy and seems like there is always a delay when I scroll the page so it is not as smooth as what we see in the tutorial. Does anyone have this issue? If so, please share your thoughts and hope we could figure this out.

could you share some sort of video example with us?

Does this happen if you try with new images? I would recommend seeing if a new image has the same choppiness.

I tested it with an image on my end and it looks okay.