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bug#15755: 24.3.50; cperl-mode annoyingly slow on my netbook

From: Jambunathan K
Subject: bug#15755: 24.3.50; cperl-mode annoyingly slow on my netbook
Date: Sun, 10 Nov 2013 11:01:14 +0530
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)

A quick update:  Some magic has happened between the following revisions:

   114868 address@hidden
   115051 address@hidden

The slowdown with the recipe above is not that noticeable now.  Is this
magic or is there an explanation?

Jambunathan K <address@hidden> writes:

> Stefan Monnier <address@hidden> writes:
>>> On my netbook (HP Mini 110) cperl-mode responds so slowly that it is
>>> very annoying to type.
>> Usually, cperl-mode is fast enough (most of my machines are about as
>> powerful as a typical netbook).  So maybe you're just hitting a bug
>> (tho, maybe you're hitting a pathological case, as well).
>> Do you have some test case we can use to reproduce the problem?
> If indeed this is a bug, I would call it a "showstopper" for cperl-mode.
> Here is a recipe.  The file used below is the Oddmuse's Wiki engine.
> mkdir ~/tmp
> cd ~/tmp
> wget http://git.savannah.gnu.org/cgit/oddmuse.git/plain/wiki.pl
> emacs -Q
> Here is a report from M-x view-lossage RET.  I do this:
> 1. C-x C-f ~/tmp/wiki.pl
> 2. M-x cperl-mode
> 3. C-s ApplyRules {
> 4. C-a
> 5. Move the cursor down a few lines
> 6. C-M-e.  Jump to end of defun. Move up a few lines to seek the comment
>    line.
> 7. Type a few characters
> (5) is slow. (7) is very slow.  Meaning it takes ages for the 10 or so
> characters to be echoed.
> Interestingly, after (2) I see the following message reported by
> cperl-mode.  I am not sure whether the error is a cause for slow
> performance.
> Anyways, if I do,
>     perl wiki.pl
> I don't see the perl complaining about the file being bad.  So there is
> a bug somewhere.
> Apart from the recipe above, you can try the following
> 1. Mark the ApplyRules sub.
> 2. M-x indent-region it.
> With perl-mode, (1) and (2) is very quick.  But with cperl-mode things
> are bad.
> End of `qw( ... )' string/RE not found: (scan-error Unbalanced parentheses 
> 1543 155427)
> --8<---------------cut here---------------start------------->8---
> C-x C-f t m p / w i k i . p l <return> <escape> x c
> p e r l - m o d e <return> C-s A p p l y R u l e s
> SPC { C-a <down> <down> <down> <down> <down> <down>
> <down> <down> <down> <down> <down> <down> <down> C-M-e
> <up> <up> <up> C-e SPC i n s e r t i n g SPC t h i
> s SPC t e x t SPC t a k e s SPC a SPC l o t SPC o f
> SPC t i m e <escape> x v i e w - l o s s a g e <re
> turn>
> --8<---------------cut here---------------end--------------->8---
>>         Stefan

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