Re: Performance problems (CPU 100%) with NULs in files

[Eli Zaretskii]

> From: "Ludwig, Mark" <ludwig.mark@siemens.com>
> Thread-Topic: Performance problems (CPU 100%) with NULs in files
> Date: Wed, 21 Sep 2011 21:08:42 +0000
> 
> What happens is that as I scroll through the file, when the NULs are visible, 
> Emacs gets into some intensive processing for a long time (minutes, 
> sometimes!).  It eventually unwinds and repaints the display, but any 
> movement of point sends it into this loop again.  I have found that M-< or 
> M-> will quickly reposition away from the problem (assuming the beginning 
> and/or end of the file do not contain NULs).  Most other movement operations 
> send it into the loop.

Does it help to visit such files without code conversions, i.e.

  M-x find-file-literally RET FILENAME RET

?

If not, please file a bug report and attach to it an example file that
causes this slowdown.