Animations don't appear to be as smooth as original site

I would like some feedback on the smoothness of transitions. When I scroll up and down on preview mode the interactions seem to step more through the transitions rather than roll smoothly thru.

I am practicing by rebuilding this page
Apple podcast site

The phones should move up and the text below that should move up slightly and go from 0% to 100% opacity.

I avoided using transitions cause it just looks janky when previewing but I want to see what I am doing wrong as other sites I see it is smooth.

I guess I am just looking at some fresh eyes to tell me that the sites smoothness of animations are similar or is there a difference and what did I do wrong.

Only thing I know to say is everytime my mouse scroll wheel gets to the next “click or stop” the site slightly stops. Is that normal.

thanks


Here is my site Read-Only: **[LINK]