Slow cperl-mode in emacs 22 & 23

Slow cperl-mode in emacs 22 & 23

[Hinrik Örn Sigurðsson]

I'm new to emacs and the first thing I tried after installing it was
to edit a Perl file (~3000 lines) and switch to cperl-mode (via M-x
cperl-mode). Moving around in the file with cperl-mode is very slow. I
have to wait at least a second to see results after hitting Page Down.
Editing smaller files (~500 lines) is faster but still a little
sluggish. The default perl-mode is very fast in all cases.

I have done no configuration (no ~/.emacs or ~/.emacs.d). I tried
emacs 22.2 and two snapshots of emacs 23 (2008-10-13 and 2009-03-20),
they all have this speed issue in cperl-mode. I'm running Ubuntu 8.10.

Re: Slow cperl-mode in emacs 22 & 23

[Hinrik Örn Sigurðsson]

I forgot to add that I get same the results whether I'm in the console
or the GUI.

Re: Slow cperl-mode in emacs 22 & 23

[Hinrik Örn Sigurðsson]

Oh, and I tried it on both my laptop and workstation. Same deal.

This is the Perl file in question, if anyone's interested:
http://cpansearch.perl.org/src/BINGOS/POE-Component-IRC-6.04/lib/POE/Component/IRC.pm

Slow cperl-mode in emacs 22 & 23

[Hinrik Örn Sigurðsson]

(It seems my original email didn't make it to the list. I'm trying again now.)

I'm new to emacs and the first thing I tried after installing it was
to edit a Perl file (~3000 lines) and switch to cperl-mode (via M-x
cperl-mode). Moving around in the file with cperl-mode is very slow. I
have to wait at least a second to see results after hitting Page Down.
Editing smaller files (~500 lines) is faster but still a little
sluggish. The default perl-mode is very fast in all cases.

I get same the results whether I'm in the console
or the GUI, and whether I'm on my laptop or workstation (both Ubuntu 8.10).

I have done no configuration (no ~/.emacs or ~/.emacs.d). I tried
emacs 22.2 and two snapshots of emacs 23 (2008-10-13 and 2009-03-20).
They all have the same issue.

This is the Perl file in question, if anyone's interested:
http://cpansearch.perl.org/src/BINGOS/POE-Component-IRC-6.04/lib/POE/Component/IRC.pm

Re: Slow cperl-mode in emacs 22 & 23

[Hinrik Örn Sigurðsson]

Same deal with a fresh cvs checkout of emacs.

Re: Slow cperl-mode in emacs 22 & 23

[Hinrik Örn Sigurðsson]

This problem has been resolved. Apparently cperl-mode will be slow if
loaded on top of perl-mode. Putting the following in my ~/.emacs fixed
it:

(defalias 'perl-mode 'cperl-mode)

Re: Slow cperl-mode in emacs 22 & 23

[Tim X]

Hinrik Örn Sigurðsson <hinrik.sig@gmail.com> writes:

> Same deal with a fresh cvs checkout of emacs.
>
>

I've not used cperl-mode for a while, but some points to consider....

1. In one of your posts, you mentioned a reference to cpan. Are you
using a version of cperl from cpan or the one that comes bundled with
emacs? 

2. Be careful regarding cperl version numbers. It is a little confusing
as there is one 'fork' of cperl that is bundled with emacs and another
which is maintained by the author. The version numbers are not in sync
(at least they didn't use to be), so it can sometimes be a bit
confusing as to whether your running the latest version or not. Best
thing to do is get the latest version from the author's website

http://math.berkeley.edu/~ilya/software/emacs/

Ilya is a regular contributor to this group, so you may be lucky enough
to get a response directly from the mode author. 

3. Note that cperl mode has some pretty advanced features and is quite
customizable. On large files, you may get better resonse if you turn off
some of the options, particularly the 'hairy' ones may have significant
performance impact on a large file. Try turning some of them off and
then re-enabling different bits and see if that helps with the
performance. 

4. A 3,000 line perl script sounds a tad scarey. I like perl and have in
the past spent many months working exclusively in perl. One lesson I
learnt was to keep my perl source files as small as possible. I've found
things a lot easier if the code is broken up into your own
modules. Maybe that would help?

regards,

Tim

-- 
tcross (at) rapttech dot com dot au