- (void)scrollViewDidScroll:(UIScrollView *)scrollView too slow in iOS 8

I have a problem where scrolling up/down and setting the contentoffset from within scrollviewdidscroll on a secondary scrollview causes a minor jittery behaviour... or more accurately a low frame rate.

I currently rely on scrollViewDidScroll to manage effects such as Parallax in my UIScrollView, these effects are applied by listening for scrollViewDidScroll, but the turn around time for each call of this method is (for some reason), too slow and causes enough of a delay for it to look kind of bad when scrolling.

Interestingly, iOS 9, runs fine.

I've tried alternative methods, such as turning off images or using AsyncDisplayKit but both have no effect on the number of times scrollViewDidScroll is fired.

It looks to me that I may need to rearchitect the way I create the parallax effect, but I'm hesitant to in case there is a quick fix.

via Chebli Mohamed