ultra-scroll

ultra-scroll enables fast, smooth, jump-free scrolling for Emacs on
all builds that support varying pixel scroll delta event data.  On
emacs-mac it retains the swipe-to-scroll and pinch-out for tab
overview capabilities of that port.  On all ports, it can scroll
past images or other content taller than the window without issue.

See also `pixel-scroll-precision-mode' in pixel-scroll.el.