Recently I visited the Apple store and compared the latest 11 inch iPad Air (A14 processor) and iPad Pro (M1 processor) models side-by-side. I loaded up Apple’s website in Safari and scrolled. The Pro is noticeably butter-smooth, while the Air stutters. My iPhone also stutters in the same way, but it’s never bothered me before. It’s only after looking at the performance of the M1-driven iPad Pro that I knew to look for it. And I previously had a similar experience noticing how much smoother my iPhone was than my old Android phones!
I don’t know for sure the processor is the difference, this is just a report of my observations.