bug#18530: 24.3; Emacs unable to handle very large lines

[Eli Zaretskii]

> From: Alexis <flexibeast@gmail.com>
> Date: Sun, 28 Sep 2014 20:10:45 +1000
> Cc: Amit Barve <mtbar131@gmail.com>
> 
> *nod* Yes, when i open test.txt in Vim, moving to the end of the line
> with $, or to the beginning of the line with ^, both take less than a
> second. And cursor movement with j, k etc. is basically
> responsive. Whereas in Emacs, trying to move point up or down results in
> 20+ seconds of lag before point is actually moved.

Does Vim support different font sizes on the same line, inline images,
display properties, overlays, invisible text, etc.?  These features is
what makes this particular case hard; other editors don't need to
handle all that complexity.