bug#21597: 25.0.50; Extremely slow redisplay on emacsclient

[Kaushal Modi <kaushal.modi@gmail.com>]

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Hi,

BUG: All basic operations like navigation (C-p, C-n,..), typing in the
minibuffer, etc are extremely sluggish.. latency in the order of 10s of
seconds!

I am seeing this bug since the emacs built from master yesterday and even
in the latest build as of writing this email.

The bug is not seen when running emacs -Q&.

But it is seen if try to get "emacs -Q" behaviour in emacsclient.

So I moved my actual init.el to a temp file and add just the below code in
the init.el

(require 'server)
(if (not (server-running-p))
    (server-start))

- After that, start "emacsclient -a '' -c &". The *scratch* buffer should
open in a frame.
- Now when you do something simple like C-p, you won't see the cursor move
at all. But as soon as you try to type something, it will get typed on the
above line, that too with a huge latency between the moment you hit a
character and that char showing up in the *scratch* buffer.

I believe this to have been caused by this commit:
http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=5c9304ea86b8cfc9d0b6d7769b90bd56e5dd1313


In GNU Emacs 25.0.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.23)
 of 2015-10-01
Repository revision: 9c86325b69d75e9b17ff468f5a2220597979635f
Windowing system distributor 'The X.Org Foundation', version 11.0.60900000
System Description: Red Hat Enterprise Linux Workstation release 6.6
(Santiago)

Configured using:
 'configure --prefix=/home/kmodi/usr_local/apps/6/emacs/master
 'CPPFLAGS=-fgnu89-inline -I/home/kmodi/usr_local/6/include
 -I/usr/include/freetype2 -I/usr/include'
 'LDFLAGS=-L/home/kmodi/usr_local/6/lib
 -L/home/kmodi/usr_local/6/lib64''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK2 X11

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=none
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-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 messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Making completion list...

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message dired format-spec
rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util help-fns help-mode easymenu cl-loaddefs pcase cl-lib mail-prsvr
mail-utils server time-date mule-util tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel x-win term/common-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
frame cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan
thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian
slovak czech european ethiopic indian cyrillic chinese charscript
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote dbusbind inotify
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 80898 8068)
 (symbols 48 19419 0)
 (miscs 40 74 110)
 (strings 32 13203 5056)
 (string-bytes 1 399479)
 (vectors 16 10847)
 (vector-slots 8 417204 6305)
 (floats 8 133 42)
 (intervals 56 222 0)
 (buffers 976 13)
 (heap 1024 27076 657))



--
Kaushal Modi

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