Re: Why emacs rendering is slow when encountering long lines?

[Eli Zaretskii]

> From: Dan Espen <despen@verizon.net>
> Date: Sun, 20 Oct 2013 11:50:07 -0400
> 
> I just opened /usr/bin/ls.  It has pretty long lines.
> It also scrolls pretty fast in both directions.

That's because /usr/bin/ls is a binary file, so Emacs automatically
visits it literally (i.e. with "no-conversions").  Many display
features are turned off in buffers that visit files literally.

> I think you need to provide more information, including emacs version
> and the mode that emacs goes into.
> Also see if the problem is still there when you start with emacs -Q.

Indeed.