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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







  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

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