In certain situations, the caching of syntax-ppss can seem to be
insufficient for good performance when syntax-ppss is invoked in a tight
loop. smartparens is a popular package that currently invokes
syntax-ppss in a tight loop (about 30-100 times depending on how many
match pairs are configured). syntax-ppss has caching built in, but it is
willing to use a cache from a further back position and do a
`parse-partial-sexp` from the old position to the current. Afterwards,
it does not set the cache with the current position. As such, in the
pathological case, it can parse ~2000 characters 30-100 times in a tight
loop. This is slow enough to show up in profiling and affect typing
latency.

To repro, install:

smartparens (you can use
https://github.com/aaronjensen/smartparens/tree/limit-binding-of-case-fold-search
to alleviate a different performance issue which could distract in the profiling)
elixir-mode

Load this file into a buffer, ensure elixir-mode is enabled: https://gist.github.com/aaronjensen/d4cd40347a916dd36c8239afecf64a7d

Go down to the chunk_by function and type inside of it. If you profile,
you'll see that syntax-ppss rises to the top. Here is an example
reversed profile:

+ redisplay 218 32%
- progn 120 18%
- if 120 18%
- condition-case 120 18%
- let 120 18%
+ syntax-ppss 120 18%
+ sit-for 101 15%
+ sp--looking-back 55 8%
+ font-lock-fontify-keywords-region 45 6%
+ alchemist-project-root 41 6%

For what it is worth, if the file is longer this tends to not happen as
syntax-ppss ends up executing for something (end of buffer it seems) outside of the "close"
heuristic which will ultimately cause the syntax-ppss-last to get set to
the current position for the tight loop. The issue is only when the
first branch of syntax-ppss is taken in a tight loop and pos - old-pos
is great enough.

Please see https://github.com/Fuco1/smartparens/pull/629 for additional
context and discussion.

Thanks!

Aaron

In GNU Emacs 25.0.95.1 (x86_64-apple-darwin15.5.0, NS appkit-1404.47 Version 10.11.5 (Build 15F34))
of 2016-06-10 built on aaronmbp.local
Windowing system distributor 'Apple', version 10.3.1404
Configured using:
'configure --disable-dependency-tracking --disable-silent-rules
--enable-locallisppath=/usr/local/share/emacs/site-lisp
--infodir=/usr/local/Cellar/emacs/25.0.95/share/info/emacs
--prefix=/usr/local/Cellar/emacs/25.0.95 --with-xml2 --without-dbus
--with-gnutls --with-rsvg --with-imagemagick --with-ns
--disable-ns-self-contained'

Configured features:
JPEG RSVG IMAGEMAGICK NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS
NS

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

Major mode: Elixir

Minor modes in effect:
alchemist-mode: t
goto-address-prog-mode: t
bug-reference-prog-mode: t
auto-highlight-symbol-mode: t
clean-aindent-mode: t
highlight-numbers-mode: t
highlight-parentheses-mode: t
rainbow-delimiters-mode: t
yas-global-mode: t
yas-minor-mode: t
projectile-global-mode: t
projectile-mode: t
recentf-mode: t
shackle-mode: t
global-hungry-delete-mode: t
hungry-delete-mode: t
evil-mc-mode: t
hl-todo-mode: t
global-spacemacs-whitespace-cleanup-mode: t
spacemacs-whitespace-cleanup-mode: t
ws-butler-global-mode: t
ws-butler-mode: t
winner-mode: t
window-numbering-mode: t
volatile-highlights-mode: t
global-vi-tilde-fringe-mode: t
vi-tilde-fringe-mode: t
spaceline-info-mode: t
spaceline-helm-mode: t
save-place-mode: t
savehist-mode: t
popwin-mode: t
persp-mode: t
Info-breadcrumbs-in-mode-line-mode: t
ido-vertical-mode: t
helm-mode: t
global-git-gutter+-mode: t
global-git-commit-mode: t
async-bytecomp-package-mode: t
shell-dirtrack-mode: t
flyspell-mode: t
global-flycheck-mode: t
flycheck-mode: t
flx-ido-mode: t
eyebrowse-mode: t
global-evil-surround-mode: t
evil-surround-mode: t
global-evil-search-highlight-persist: t
evil-search-highlight-persist: t
show-smartparens-global-mode: t
show-smartparens-mode: t
smartparens-mode: t
evil-escape-mode: t
global-anzu-mode: t
anzu-mode: t
eval-sexp-fu-flash-mode: t
diff-auto-refine-mode: t
company-mode: t
hybrid-mode: t
which-key-mode: t
override-global-mode: t
global-undo-tree-mode: t
undo-tree-mode: t
evil-mode: t
evil-local-mode: t
spacemacs-leader-override-mode: t
global-spacemacs-leader-override-mode: t
global-hl-line-mode: t
xterm-mouse-mode: t
global-auto-revert-mode: t
global-page-break-lines-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
font-lock-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
column-number-mode: t
line-number-mode: t
transient-mark-mode: t
abbrev-mode: t
hs-minor-mode: t

Recent messages:
20394 19299 [100 times]
20390 19299 [2 times]
20394 19299
syntax-ppss
No profiler stopped
CPU profiler started
CPU profiler stopped
CPU profiler started
Quit
Mark saved where search started [2 times]

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/Users/aaronjensen/.emacs.d/elpa/org-plus-contrib-20160718/ob-java hides /usr/local/Cellar/emacs/25.0.95/share/emacs/25.0.95/lisp/org/ob-java
/Users/aaronjensen/.emacs.d/elpa/org-plus-contrib-20160718/ob-io hides /usr/local/Cellar/emacs/25.0.95/share/emacs/25.0.95/lisp/org/ob-io
/Users/aaronjensen/.emacs.d/elpa/org-plus-contrib-20160718/ob-haskell hides /usr/local/Cellar/emacs/25.0.95/share/emacs/25.0.95/lisp/org/ob-haskell
/Users/aaronjensen/.emacs.d/elpa/org-plus-contrib-20160718/ob-gnuplot hides /usr/local/Cellar/emacs/25.0.95/share/emacs/25.0.95/lisp/org/ob-gnuplot
/Users/aaronjensen/.emacs.d/elpa/org-plus-contrib-20160718/ob-fortran hides /usr/local/Cellar/emacs/25.0.95/share/emacs/25.0.95/lisp/org/ob-fortran
/Users/aaronjensen/.emacs.d/elpa/org-plus-contrib-20160718/ob-exp hides /usr/local/Cellar/emacs/25.0.95/share/emacs/25.0.95/lisp/org/ob-exp
/Users/aaronjensen/.emacs.d/elpa/org-plus-contrib-20160718/ob-eval hides /usr/local/Cellar/emacs/25.0.95/share/emacs/25.0.95/lisp/org/ob-eval
/Users/aaronjensen/.emacs.d/elpa/org-plus-contrib-20160718/ob-emacs-lisp hides /usr/local/Cellar/emacs/25.0.95/share/emacs/25.0.95/lisp/org/ob-emacs-lisp
/Users/aaronjensen/.emacs.d/elpa/org-plus-contrib-20160718/ob-dot hides /usr/local/Cellar/emacs/25.0.95/share/emacs/25.0.95/lisp/org/ob-dot
/Users/aaronjensen/.emacs.d/elpa/org-plus-contrib-20160718/ob-ditaa hides /usr/local/Cellar/emacs/25.0.95/share/emacs/25.0.95/lisp/org/ob-ditaa
/Users/aaronjensen/.emacs.d/elpa/org-plus-contrib-20160718/ob-css hides /usr/local/Cellar/emacs/25.0.95/share/emacs/25.0.95/lisp/org/ob-css
/Users/aaronjensen/.emacs.d/elpa/org-plus-contrib-20160718/ob-core hides /usr/local/Cellar/emacs/25.0.95/share/emacs/25.0.95/lisp/org/ob-core
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/Users/aaronjensen/.emacs.d/elpa/org-plus-contrib-20160718/ob-calc hides /usr/local/Cellar/emacs/25.0.95/share/emacs/25.0.95/lisp/org/ob-calc
/Users/aaronjensen/.emacs.d/elpa/org-plus-contrib-20160718/ob-C hides /usr/local/Cellar/emacs/25.0.95/share/emacs/25.0.95/lisp/org/ob-C
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Features:
(shadow sort mail-extr emacsbug evil-nerd-commenter
evil-nerd-commenter-operator tabify helm-command helm-elisp helm-eval
misearch multi-isearch network-stream nsm starttls dockerfile-mode
alchemist alchemist-macroexpand alchemist-company alchemist-help
alchemist-complete alchemist-refcard alchemist-phoenix alchemist-compile
alchemist-iex alchemist-message alchemist-hooks alchemist-hex
alchemist-mix alchemist-info alchemist-goto alchemist-scope
alchemist-eval alchemist-interact alchemist-server alchemist-execute
alchemist-report alchemist-test-mode alchemist-project alchemist-file
alchemist-key alchemist-utils elixir-mode pkg-info epl elixir-smie
company-tern dash-functional js-doc iswitchb js2-imenu-extras
js2-refactor js2r-paredit js2r-conveniences js2r-conditionals
js2r-wrapping js2r-functions js2r-vars js2r-iife js2r-formatting
js2r-helpers skewer-mode cache-table simple-httpd tern cursor-sensor
js2-mode js cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles
cc-align cc-engine cc-vars cc-defs imenu flycheck-elm company-robe
evil-matchit robe url-handlers inf-ruby rubocop ruby-tools sh-script
executable yaml-mode auto-compile packed elisp-slime-nav
evil-cleverparens evil-cleverparens-text-objects evil-cleverparens-util
paredit lispy swiper ivy delsel iedit iedit-lib multiple-cursors-core
lispy-inline avy semantic/db eieio-base semantic/util-modes
semantic/util semantic semantic/tag semantic/lex semantic/fw mode-local
cedet evil-ediff ediff-merg ediff-wind ediff-diff ediff-mult ediff-help
ediff-init ediff-util ediff edebug lispy-tags goto-addr bug-reference
auto-highlight-symbol clean-aindent-mode highlight-numbers parent-mode
highlight-parentheses hideshow rainbow-delimiters company-files
company-keywords company-etags company-gtags company-template
company-dabbrev-code company-dabbrev company-capf org-eldoc evil-org
ob-shell org-bullets org-download url-http tls gnutls url-auth url-gw
toc-org ert debug clojure-snippets yasnippet image-file org-rmail
org-mhe org-irc org-info org-gnus org-docview org-bibtex bibtex org-bbdb
org-w3m mu4e-maildirs-extension org-mu4e mu4e mu4e-speedbar speedbar
sb-image ezimage dframe mu4e-main mu4e-context mu4e-view epa
mu4e-headers mu4e-compose mu4e-draft mu4e-actions rfc2368 smtpmail
sendmail mu4e-mark mu4e-message html2text mu4e-proc mu4e-utils doc-view
jka-compr mu4e-lists mu4e-vars mu4e-meta ox-gfm ox-md ox-latex
ox-icalendar ox-html ox-ascii ox-publish ox org-element avl-tree org
org-macro org-footnote org-pcomplete org-list org-faces org-entities
org-version ob-emacs-lisp ob ob-tangle ob-ref ob-lob ob-table ob-exp
org-src ob-keys ob-comint ob-core ob-eval org-compat org-macs
org-loaddefs cal-menu calendar cal-loaddefs vc-git projectile grep
ibuf-ext ibuffer recentf tree-widget shackle hungry-delete
fill-or-unfill fix-autorevert-breaking-git eval-overlay
fix-bracketed-paste company-simple-complete init-terminal-cursor
evil-terminal-cursor-changer init-org init-magit init-elixir init-deft
evil-mc evil-mc-command-execute evil-mc-command-record
evil-mc-cursor-make evil-mc-region evil-mc-cursor-state evil-mc-undo
evil-mc-vars evil-mc-known-commands evil-mc-common hl-todo xterm-color
spacemacs-whitespace-cleanup ws-butler winner window-numbering etags
xref project volatile-highlights vi-tilde-fringe tmux spaceline-config
spaceline-segments spaceline powerline powerline-separators color
powerline-themes smartparens-config smartparens-ruby smartparens-html
saveplace savehist ruby-test-mode pcre2el rxt re-builder ruby-mode smie
popwin persp-mode osx-trash info+ image-mode ido-vertical-mode helm-mode
helm-files image-dired dired-x dired-aux ffap helm-buffers helm-elscreen
helm-tags helm-bookmark helm-adaptive helm-info bookmark pp helm-locate
helm-grep helm-regexp helm-external helm-net browse-url xml url
url-proxy url-privacy url-expand url-methods url-history url-cookie
url-domsuf url-util mailcap helm-utils compile helm-help helm-types
git-gutter-fringe+ fringe-helper git-gutter+ git-commit with-editor
async-bytecomp async tramp-sh server log-edit message rfc822 mml mml-sec
epg mailabbrev mail-utils gmm-utils mailheader pcvs-util add-log
docker-tramp tramp-cache tramp tramp-compat tramp-loaddefs trampver
shell pcomplete comint ansi-color flyspell-correct-helm helm helm-source
helm-multi-match helm-lib dired flyspell-correct flyspell ispell
flycheck find-func flx-ido flx ido eyebrowse format-spec
exec-path-from-shell evil-unimpaired f s evil-surround
evil-search-highlight-persist evil-numbers evil-lisp-state smartparens
evil-indent-plus evil-exchange evil-escape evil-args evil-anzu anzu
cider-eval-sexp-fu eval-sexp-fu rx highlight noutline outline diff-hl
vc-dir ewoc vc vc-dispatcher diff-mode company-web dash company-css
company web-completion-data adaptive-wrap hybrid-mode
evil-evilified-state which-key use-package diminish bind-key hydra lv
cus-edit cus-start cus-load evil evil-integration undo-tree diff
evil-maps evil-commands evil-jumps evil-command-window evil-types
evil-search evil-ex evil-macros evil-repeat evil-states evil-core
evil-common windmove thingatpt rect evil-digraphs evil-vars ring info
bind-map quelpa url-parse auth-source gnus-util password-cache url-vars
package-build mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047
rfc2045 ietf-drums mm-util help-fns mail-prsvr json map lisp-mnt hl-line
xt-mouse autorevert filenotify disp-table wid-edit monokai-theme
finder-inf init-html init-javascript sgml-mode init-evil
core-configuration-layer eieio-compat cl-seq ht cl warnings package
epg-config seq eieio byte-opt bytecomp byte-compile cl-extra help-mode
cconv eieio-core core-spacemacs core-use-package-ext
core-transient-state core-micro-state core-toggle core-keybindings
core-fonts-support core-spacemacs-buffer derived edmacro kmacro
core-funcs cl-macs gv core-themes-support core-display-init
core-auto-completion core-release-management core-dotspacemacs
core-command-line core-debug advice profiler easymenu cl-loaddefs cl-lib
page-break-lines easy-mmode subr-x pcase time-date mule-util tooltip
eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel
ns-win ucs-normalize term/common-win 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 kqueue cocoa ns multi-tty
make-network-process emacs)

Memory information:
((conses 16 1068122 891337)
(symbols 48 82031 35)
(miscs 40 6570 10733)
(strings 32 209973 395364)
(string-bytes 1 7368564)
(vectors 16 130382)
(vector-slots 8 2505920 346982)
(floats 8 1994 3740)
(intervals 56 13720 14404)
(buffers 976 61))

Aaron