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bug#14051: Fwd: 24.3; Slow scrolling in term modes

From: Bryan Bishop
Subject: bug#14051: Fwd: 24.3; Slow scrolling in term modes
Date: Sun, 24 Mar 2013 23:42:10 -0500

This bug report will be sent to the Bug-GNU-Emacs mailing list
and the GNU bug tracker at debbugs.gnu.org.  Please check that
the From: line contains a valid email address.  After a delay of up
to one day, you should receive an acknowledgment at that address.

Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':

The window scrolling performance ("multi-term" and plain old "term" in
this case) in emacs 24 is terrible after a few thousand lines of
scrollback, slowly getting worse and worse and after about 5000 lines of
scrollback takes about a 1/2 second to render the next chunk of text.

How I can replicate the problem:

emacs -Q
M-x term
find /

(The output of the find command whizzes by, and then starts to get jerky
and slow when scrollback history is > 2000 lines)

I've installed the stock emacs24 from linux mint/ubuntu packages
(24.1.1), and a custom
compiled version of 24.3.1 without any special tricks and a compiler
option of -O3 and the term mode behavior is all the same, and this
behavior even shows up with "emacs -Q".

It seems the same with multi-term, ansi-term, nterm, it doesn't matter.
This does work very fast in eshell and in terminal-emulator mode.
What is weird is ALL the terminal modes in Emacs 23 seem to work
great, but not Emacs 24.

Any ideas how I can make this mode faster?  My suspicion was around
font-lock-mode but I've turned that off with no effect.  The fact that
it is still slow without my init file using -Q and seems to be really
fast in Emacs 23 has me stumped.

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file

In GNU Emacs 24.3.1 (x86_64-unknown-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2013-03-13 on badwolf
Windowing system distributor `The X.Org Foundation', version 11.0.11300000
System Description:    Linux Mint 14 Nadia

Configured using:
 `configure '--prefix=/usr/local' 'CFLAGS=-O3''

Important settings:
  value of $LC_CTYPE: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Buffer Menu

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-x 1 M-x t e r m <return> <return>
f i n d <return> C-c C-c C-c C-c C-c C-c e x i t <return>

Recent messages:
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Saved text from "The window scrolling performance ("multi"

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