bug#48377: 27.1; pixel-scroll-mode is unusable with popular modelines

[Rudi C]

pixel-scroll-mode has severe performance issues with some popular
modelines, as documented on:

- https://github.com/seagle0128/doom-modeline/issues/199

- https://github.com/syl20bnr/spacemacs/issues/11549

- 
https://www.reddit.com/r/emacs/comments/8rml8f/emacs_26_pixelscrollmode_gcs_like_theres_no/

Is this unsolvable? pixel-scroll-mode is critical when one works with
inline images, such as an org-mode workflow where notes are taken using
screenshots. I have tried some alternative non-pixel-scrolling
workarounds, but they aren't in the end usable enough for me.

I am open to experimenting with forks such as
https://github.com/emacs-ng/emacs-ng if they do have this feature.


In GNU Emacs 27.1 (build 1, x86_64-apple-darwin20.3.0, NS
appkit-2022.30 Version 11.2.1 (Build 20D75))
 of 2021-03-13 built on Fereidoons-MacBook-Pro.local
System Description:  macOS 11.2.1

Recent messages:
Quit
Configured using:
 'configure --disable-dependency-tracking --disable-silent-rules
 --enable-locallisppath=/usr/local/share/emacs/site-lisp
 --infodir=/usr/local/Cellar/emacs-plus@27/27.1/share/info/emacs
 --prefix=/usr/local/Cellar/emacs-plus@27/27.1 --with-xml2 --with-gnutls
 --without-dbus --with-imagemagick --with-modules --with-rsvg
 --with-xwidgets --with-ns --disable-ns-self-contained'

Configured features:
RSVG IMAGEMAGICK GLIB NOTIFY KQUEUE ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS XIM NS MODULES THREADS XWIDGETS JSON PDUMPER LCMS2
GMP

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

Major mode: Org

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  +word-wrap-mode: t
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  global-company-mode: t
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  toc-org-mode: t
  hl-todo-mode: t
  global-git-commit-mode: t
  global-auto-revert-mode: t
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  global-font-lock-mode: t
  font-lock-mode: t
  window-divider-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
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  visual-line-mode: t
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Load-path shadows:
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Memory information:
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