Choppy scrolling is a well known and long-standing issue and does affect many people at least, including me with the latest top of the line iPhone and to a lesser extent iPad.
There’s a lot of hyperbole in this thread (no it’s not epilepsy inducing) but it surely isn’t smooth as it should be, either:
Some of the issues reported in this long-running thread were solved, but choppy scrolling remains
Recurring grey images that are not just a result of initial caching have started to affect several people after the last two updates. Not me but it has been reported in several threads: