iOS overflow-x (or position absolute) makes scrolling choppy?

You could try setting width:100% on .page-wrapper and set that to overflow:hidden and position:relative. That might prevent the horizontal scroll.

Updated 10/12/2012

Thanks for the code example. It really helped me see your intent and the issue with scrolling more clearly. It looks like you need -webkit-overflow-scrolling. Add -webkit-overflow-scrolling: touch; to page-wrapper. Here's an [updated test page] with that rule applied. You can compare with test page in my comment below to see the difference.

Try applying it to every element:

* {
  -webkit-overflow-scrolling: touch;
}

This done the job for me so that it's not a problem on any page:

html {
  -webkit-overflow-scrolling: touch;
}