@hi

While it's been over a decade since I rooted a Nook Simple Touch (e-ink reader) and attempted to use the command-line there (at the time, using the on-screen keyboard), it wasn't horrible. Not great, but not horrible.

I did find that a proper termcap+vi worked better than vim which liked to render a lot more stuff on the screen. Also, particular settings (like 'ruler', 'showmode', 'report', incremental search, possibly visual-bell/flash, etc; and if using vim, items at `:help slow-terminal`) produced a lot more (re)draw & refresh of the screen.