Re: Setting bidi-paragraph-direction in comint modes

[Chong Yidong <cyd@gnu.org>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Chong Yidong <cyd@gnu.org>
>> Date: Tue, 14 Feb 2012 14:35:52 +0800
>> 
>> 1. emacs -Q
>> 2. M-x shell RET
>> 3. ls /usr/share/doc    (Prints about 2000 lines on my computer)
>> 4. Repeat step 3 many times.
>> 
>> As the buffer gets to about 8000 lines, redisplay slows to a crawl.
>
> I cannot reproduce this here.  I tried the same in a directory with
> 2190 files, generated a 10K-line buffer with no empty lines, and I see
> no "crawl", only some minor slowdown.  Maybe I didn't try the commands
> you did?  Which Emacs commands caused such a slow redisplay on your
> machine?

Like I said, it's simply `ls /usr/share/doc'.

You say that there is "some minor slowdown": that's the same slowdown
I'm referring to, I think.  On my machine, the performance difference
with and without bidi-paragraph-direction is extremely noticeable.