From: Matt Lundin <mdl@imapmail.org>
To: "Jörg Walter" <jwalt@garni.ch>
Cc: 12463@debbugs.gnu.org
Subject: bug#12463: 24.2; pos-visible-in-window-p gets slower over time
Date: Tue, 18 Sep 2012 10:05:34 -0500 [thread overview]
Message-ID: <87k3vrnzgh.fsf@fastmail.fm> (raw)
In-Reply-To: <5511358.p8J1TLefsG@queen> ("Jörg Walter"'s message of "Tue, 18 Sep 2012 11:46:13 +0200")
Jörg Walter <jwalt@garni.ch> writes:
> I've done some additional tests: It does *not* happen with Ubuntu's
> emacs23 (23.3.1). Just for cross-checking, I ran Win32 emacs 24.2 once
> via wine and once in VirtualBox+WinXP, in both cases no bug.
>
> It *does* happen with Ubuntu's emacs24 (24.1.1), which is where I
> first noticed the problem. It also happens on all X toolkits (gtk,
> gtk3, athena, lucid).
Does it happen when using x instead of xft as the font backend? I have
found that xft rendering is sluggish in emacs 24 (on Arch Linux, in my
case). A single call to pos-visible-in-window-p can take as much as 0.3
secs according to ELP (e.g., when opening an outline heading, especially
if it contains multi-byte encodings). This slowdown does not occur when
xft is turned off (i.e, by placing "Emacs.FontBackend: x" in
.Xresources).
AFAICT, the bottleneck seems to be in the emacs xft rendering. I tested
this by opening two frames showing the same outline buffer. One of the
frames was a X frame using xft fonts; another frame was running in a
console (urxvt, which also uses xft rendering but shows no similar
slowdown). When opening an outline entry containing multibyte
characters, it appeared instantly in the console frame but only after a
substantial lag on the X frame.
In other words, the culprit may be something other than
pos-visible-in-window-p. For instance, when running emacs on x with xft
enabled, I find it can take as much as 3-4 seconds (according to elp) to
create a new frame with C-x 5 2. When running emacs on x with xft
disabled, new frames are created immediately.
Best,
Matt
next prev parent reply other threads:[~2012-09-18 15:05 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-17 23:51 bug#12463: 24.2; pos-visible-in-window-p gets slower over time Jörg Walter
2012-09-18 7:46 ` Eli Zaretskii
2012-09-18 9:46 ` Jörg Walter
2012-09-18 10:23 ` Eli Zaretskii
2012-09-18 15:05 ` Matt Lundin [this message]
2012-09-18 16:24 ` Eli Zaretskii
2012-09-18 15:17 ` Chong Yidong
2012-09-18 16:18 ` Jörg Walter
2012-09-20 23:22 ` Juanma Barranquero
2012-09-21 3:52 ` Chong Yidong
2012-09-21 5:42 ` Chong Yidong
2012-09-21 7:34 ` Eli Zaretskii
2012-09-21 9:24 ` Chong Yidong
2012-09-21 10:47 ` Juanma Barranquero
2012-09-21 12:33 ` Eli Zaretskii
2012-09-21 16:38 ` Stefan Monnier
2012-09-21 16:58 ` Eli Zaretskii
2012-09-21 20:34 ` Stefan Monnier
2012-09-22 6:58 ` Eli Zaretskii
2012-09-22 20:20 ` Stefan Monnier
2012-09-22 20:31 ` Juanma Barranquero
2012-09-23 9:17 ` Chong Yidong
2012-09-23 3:50 ` Eli Zaretskii
2012-09-21 9:10 ` Juanma Barranquero
2012-09-21 10:01 ` Chong Yidong
2012-09-21 17:03 ` Eli Zaretskii
2012-09-21 17:07 ` Juanma Barranquero
2012-09-21 17:45 ` Eli Zaretskii
2012-09-22 1:23 ` Chong Yidong
2012-09-22 8:36 ` Eli Zaretskii
2012-09-22 11:05 ` Chong Yidong
2012-09-22 11:18 ` Eli Zaretskii
2012-09-22 14:14 ` Chong Yidong
2012-09-22 14:25 ` Eli Zaretskii
2012-09-22 19:20 ` Juanma Barranquero
2012-09-22 19:46 ` Eli Zaretskii
2012-09-22 19:53 ` Juanma Barranquero
2012-09-23 3:48 ` Eli Zaretskii
2012-09-21 6:58 ` Eli Zaretskii
2012-09-21 8:36 ` Juanma Barranquero
2012-09-21 9:11 ` Chong Yidong
2012-09-21 9:17 ` Juanma Barranquero
2012-09-18 16:19 ` Eli Zaretskii
2012-09-18 16:26 ` Jörg Walter
2012-09-18 17:19 ` Eli Zaretskii
2012-09-18 17:31 ` Juanma Barranquero
2012-09-18 20:00 ` Eli Zaretskii
2012-09-19 2:31 ` Juanma Barranquero
2012-09-19 2:57 ` Eli Zaretskii
2012-09-19 3:03 ` Juanma Barranquero
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.gnu.org/software/emacs/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87k3vrnzgh.fsf@fastmail.fm \
--to=mdl@imapmail.org \
--cc=12463@debbugs.gnu.org \
--cc=jwalt@garni.ch \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.savannah.gnu.org/cgit/emacs.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).