bug#21453: 25.0.50; When font size is temporarily increased Emacs is slow

[Mark Karpov]

When I press ‘C-x C-=’ to temporarily increase font size Emacs is
getting considerably slower. For example, if I hold ‘C-n’ to move
several lines down the movement is not smooth. I don't think that
increasing of font size should normally result in such “effects”.



In GNU Emacs 25.0.50.19 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.6)
 of 2015-08-31 on arch
Repository revision: 62661fe759dfc826f31b032e49f0f15b40a207d5
Windowing system distributor `The X.Org Foundation', version 11.0.11702000
Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: M

Minor modes in effect:
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  shell-dirtrack-mode: t
  diff-auto-refine-mode: t
  whitespace-mode: t
  flyspell-mode: t
  text-scale-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  vimish-fold-global-mode: t
  vimish-fold-mode: t
  show-paren-mode: t
  minibuffer-electric-default-mode: t
  ido-vertical-mode: t
  ido-ubiquitous-mode: t
  ido-everywhere: t
  highlight-line-mode: t
  global-auto-revert-mode: t
  global-aggressive-indent-mode: t
  display-time-mode: t
  delete-selection-mode: t
  ace-popup-menu-mode: t
  smartparens-global-mode: t
  smartparens-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  auto-fill-function: do-auto-fill
  transient-mark-mode: t
  auto-fill-mode: 1

Recent messages:
Undo!
Mark set
Replaced 13 occurrences
<menu> / is undefined
Undo!
Mark set (rectangle mode)
Undo!
Mark set (rectangle mode) [3 times]
Saving file /home/mark/projects/programs/modalka/README.md...
Wrote /home/mark/projects/programs/modalka/README.md

Load-path shadows:
None found.

Features:
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calc-loaddefs calc-macs browse-url ace-window lisp-mnt url-http url-gw
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cl-seq aggressive-indent easy-mmode time delsel ace-popup-menu
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term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
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env code-pages mule custom widget hashtable-print-readable backquote
dbusbind inotify dynamic-setting system-font-setting font-render-setting
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Memory information:
((conses 16 1301109 278239)
 (symbols 48 59662 0)
 (miscs 40 239 1733)
 (strings 32 181294 49935)
 (string-bytes 1 6370748)
 (vectors 16 89977)
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 (floats 8 748 2372)
 (intervals 56 87834 1327)
 (buffers 976 36)
 (heap 1024 114703 68010))