bug#67981: Poor shr performance on text-only webpage

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bug#67981: Poor shr performance on text-only webpage

From:	Karthik Chikmagalur
Subject:	bug#67981: Poor shr performance on text-only webpage
Date:	Fri, 22 Dec 2023 19:02:59 -0800
The function shr-descend (part of shr.el) performs very poorly when
rendering web pages.  This is not noticeable for small documents, but
when loading https://orgmode.org/manual.html, it locks up Emacs for
10+ seconds at 100% CPU utilization on one core.  In comparison, it
loads in 2-3 seconds in Firefox without a CPU spike.  (I have a
reasonably fast three year old laptop.)

--8<---------------cut here---------------start------------->8---
;; -*- lexical-binding: t; -*-

(let ((now (float-time)))
  (add-hook 'eww-after-render-hook
            (lambda ()
              (message "EWW took %f seconds" (- (float-time) now))))
  (eww "https://orgmode.org/org.html";))

;; => EWW took 10.606935 seconds
--8<---------------cut here---------------end--------------->8---

Note that the above link is a long text only page with little to no CSS
and no Javascript.

I did some profiling to see what is slowing it down.  If I'm reading
the profile correctly, 

- About 240,587,126,505 bytes (240 GB) of memory are allocated, and
  almost all of it is split evenly between shr-render-td and
  shr-render-td-1.

- about 54% of the the rendering time (10+ seconds) is spent in
  shr-descend, split between shr-tag-table and shr-tag-div.

- About 35% of the time is spent doing GC.

Is there some reason it's this slow and allocates so much memory?  The
only thing I noticed is that shr-descend and shr-render-td both use
intern a lot, perhaps that's one source of the allocation?

If you would like me to try something specific, I can give it a shot.
Please let me know.

The CPU and memory profiles are attached, and can be loaded with M-x
profiler-find-profile.  The test was run in `emacs -q'.

Karthik

In GNU Emacs 29.1 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo
version 1.16.0, Xaw3d scroll bars)
Windowing system distributor 'The X.Org Foundation', version 11.0.12101009
System Description: NixOS 23.05 (Stoat)

Configured using:
 'configure
 --prefix=/nix/store/hxzlg5ydvndk1n4ajcsnzj8g9b8yf93g-emacs-29.1
 --disable-build-details --with-modules --with-x-toolkit=lucid
 --with-xft --with-cairo --with-native-compilation --with-tree-sitter
 --with-xinput2'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG JSON
LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XAW3D XDBE XIM XPM LUCID ZLIB

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

Major mode: Fundamental

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

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Features:
(shadow sort mail-extr emacsbug message mailcap yank-media puny dired
dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068
epg-config gnus-util text-property-search time-date mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader cl-loaddefs
comp comp-cstr warnings icons subr-x rx cl-seq cl-macs gv cl-extra
help-mode bytecomp byte-compile cl-lib sendmail rfc2047 rfc2045
ietf-drums mm-util mail-prsvr mail-utils rmc iso-transl tooltip cconv
eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type
elisp-mode mwheel term/x-win x-win term/common-win x-dnd tool-bar dnd
fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow
isearch easymenu timer select scroll-bar mouse jit-lock font-lock syntax
font-core term/tty-colors frame minibuffer nadvice seq simple cl-generic
indonesian philippine 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
composite emoji-zwj charscript charprop case-table epa-hook
jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button loaddefs
theme-loaddefs faces cus-face macroexp files window text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget keymap
hashtable-print-readable backquote threads dbusbind inotify
dynamic-setting system-font-setting font-render-setting cairo x-toolkit
x multi-tty make-network-process native-compile emacs)

Memory information:
((conses 16 80574 10107)
 (symbols 48 7212 0)
 (strings 32 20748 1634)
 (string-bytes 1 675308)
 (vectors 16 15789)
 (vector-slots 8 330368 14645)
 (floats 8 29 46)
 (intervals 56 357 0)
 (buffers 984 12))
shr-descend-original-profile-memory
Description: Binary data
shr-descend-original-profile-cpu
Description: Binary data
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- bug#67981: Poor shr performance on text-only webpage, Eli Zaretskii, 2023/12/23
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