When you scroll up or down past the current terminal page view, the scroll feels very laggy and sluggish. So much so, that if you hold j/k for long enough, you'll have to wait until the rendering's finished to do anything at all. The csv I was looking at only has 4 columns, so it's not exactly much to parse and render, but it's slow. I understand that when the page changes, you have to re-render most elements, however, stuff like the column count with it's respective tabulation, and csv headers don't need to be re-rendered, and from what I'm seeing by the column & line boundaries shifting around, they're being re-rendered (line column size should just be pre-allocated by the newline count for example). There are loads of TUI programs that despite needing to re-render portions of the page, have some decent buffering, and/or good strategies to minimize rendering to where there's no scroll lag (e.g. heh, gonk, bottom).