Smooth scrolling also worked on the Amiga Cygnus Editor in 1986 - yes, 40 years ago - on a computer with 512Kb RAM and a ~7MHz 68000 CPU, and from keyboard too. And Zed complains at launch if it doesn't find a suitable Vulkan GPU driver, since the fallback CPU driver does not provide a smooth enough experience, despite 4-5 orders of magnitude more RAM, and a ~3 orders of magnitude faster CPU, than a 40 years old Amiga...