Use `mini.animate` module.

lua/custom/plugins/mini.lua

@@ -0,0 +1,12 @@
+return {
+  "echasnovski/mini.nvim",
+  version = "*",
+  config = function ()
+    local animate = require('mini.animate')
+    animate.setup({
+      scroll = {
+        timing = animate.gen_timing.linear({ duration = 100, unit = 'total' }),
+      },
+    })
+  end
+}