Re: Emacs awfully slow on some files

[Deniz Dogan]

2009/8/11 Stefan Monnier <address@hidden>:
>> I have a file which is 1 MB long and all of the content is on a single
>> line.  Using Emacs on this file is pretty much impossible due to the
>> super-sluggish behavior.  It's embarrassing.  Why is this?
>
> It's probably a combination of various pieces of code which make
> incorrect assumptions about the expected line length.
>
>> Can it be fixed?
>
> Yes.
>
>> This is with fundamental-mode, by the way.
>
> Good: in several other modes, I could argue that such a long line is
> a bug, but fundamental-mode should cater to weird files.
>
>> `forward-char' and `backward-char' are pretty much the only usable
>> commands, even "C-h f" (describe-function) is extremely slow in
>> this scenario.
>
> Please report a bug for it via M-x report-emacs-bug, and ideally include
> some recipe (in case it depends on the actual content of the long line,
> for example, or if it needs more than "emacs -Q" to reproduce).
>

Done. I copied the contents of the bug report buffer and used the
Gmail web interface to post it. I hope it doesn't matter.

-- 
Deniz Dogan