> For older computers, the limitation was in the graphics card itself. Monitors could respond limited only by scan and refresh rates, typically 60--120 Hz, possibly better.
If we go really old, we start getting into really slooooow phospors. It would take multiple seconds for a blinking cursor to fade.
The discussion above was of the 1990s. Displays were graphical and bitmapped, not text. I remember when dragging and resizing windows with contents visible became A Thing.
And yes, I used computers in the phosphor age. And just a tad during the teletype period. I don't think either applies, though e-ink does have some characteristics of phosphors in terms over overall response rate.
The main distinction though is that phosphors painted in a line, not a full-screen refresh (though it might be interesting to see just how e-ink does refresh in super-slow motion), and then decays.
For e-ink, the characteristic is that higher-quality refreshes take longer, and that a full flush (blacking then blanking the full screen) creates a marked flash. It's much better on recent high-end displays than on, say, a ten-year-old Kindle. But there's still some of the effect visible.
Much less a problem when paging, or when there's a single cursor-point-of-change when typing text. More a problem with complex dynamic displays.
If we go really old, we start getting into really slooooow phospors. It would take multiple seconds for a blinking cursor to fade.