Laggy scrolling from touchpad in large terminals
Have an unusually large terminal (in terms of character cells). E.g. maximized terminal, tiniest font zoom.
cat
some large file with lines almost as long as the terminal's width, so that most cells are filled with letters. Pouplate the scrollback, too, with this kind of data.
Scroll by dragging the scrollbar with the mouse, or by hotkeys => nice smooth responsive, as expected.
Scroll by two-finger gesture of the touchpad => lags heavily, might easily take a few seconds to update the display.
Reproduced both with 0.74 and with master + frame clock stuff.