slow cursor speed

[Tim Garrett]

I’m near the point that I have to abandon LyX after using it 
religiously as an academic since 2000 (when it was kLyX-0.12). That 
makes me *very* sad.

The problem is that as a paragraph gets longer, the cursor gets slower. 
The paragraph doesn’t have to be very long (e.g. a few sentences) for 
this to be a significant issue. A single paragraph of plain text could 
be the only thing in the document.

Thanks to those who have helped previously but still no progress. 
Scouring forums, I see others with similar problems but no obviously 
pertinent solutions.

Many, many thanks for any further advice.


What I have tried:
1. Full reinstall including deleting prior LyX-2.3 folder in 
Application\ Support
2. Reconfiguring
3. Adding to preferences \force_paint_single_char false

My version is:

LyX Version 2.3.7
(January 1, 2023)

Library directory: /Applications/LyX.app/Contents/Resources/
User directory: ~/Library/Application Support/LyX-2.3/
Qt Version (run-time): 5.15.7 on platform cocoa
Qt Version (compile-time): 5.15.7

Build info:

LyX 2.3.7 (2023-01-01)
Configuration
   Host type:               aarch64-apple-darwin20.6.0
   Special build flags:      build=release std-regex warnings 
use-hunspell
   Bundled libraries:        boost hunspell mythes
   C++ Compiler:            c++ -stdlib=libc++ (12.0.0)
   C++ Compiler flags:       -Wall -Wextra -fPIC -Os -std=c++14  
-Wno-deprecated-register
   C++ Compiler user flags:  -isysroot 
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.1.sdk 
-arch x86_64 -mmacosx-version-min=10.14 -std=c++14  -std=c++11
   Linker flags:
   Linker user flags:       -isysroot 
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.1.sdk 
-arch x86_64 -mmacosx-version-min=10.14 
-F/Users/Shared/LyX/qt-5.15.7/lib
   Qt Frontend:
       Qt version:	   5.15.7
   Packaging:               macosx
   LyX binary dir:          
/Users/Shared/LyX/lyx-build/LyX-2.3.7.app/Contents/MacOS
   LyX files dir:           
/Users/Shared/LyX/lyx-build/LyX-2.3.7.app/Contents/Resources

My preferences are:

# LyX 2.0.4 generated this file. If you want to make your own
# modifications you should do them from inside LyX and save.

Format 1

\bind_file "my_bindings"

#
# MISC SECTION ######################################
#

# The time interval between auto-saves in seconds.
\autosave 120
# The default papersize to use.
\default_papersize "usletter"
\user_name "tgarrett"
\user_email ""

#
# SCREEN & FONTS SECTION ############################
#

\icon_set "classic"
\screen_zoom 200
\screen_font_sizes 5 7 8 9 10 12 14.4 17.260000000000002 
20.739999999999998 24.879999999999999
\open_buffers_in_tabs true
\single_close_tab_button true

#
# COLOR SECTION ###################################
#


#
# PRINTER SECTION ###################################
#


#
# TEX SECTION #######################################
#


#
# FILE SECTION ######################################
#

\load_session true

#
# PLAIN TEXT EXPORT SECTION ##############################
#


#
# SPELLCHECKER SECTION ##############################
#


#
# LANGUAGE SUPPORT SECTION ##########################
#

\spellcheck_continuously true

#
# 2nd MISC SUPPORT SECTION ##########################
#


#
# FORMATS SECTION ##########################
#

\format "dia" "dia" "DIA" "" "auto" "auto" "vector"
\format "dvi" "dvi" "DVI" "D" "xdvi" "" "document,vector,menu=export"
\format "dvi3" "dvi" "DVI (LuaTeX)" "V" "xdvi" "" 
"document,vector,menu=export"
\format "docbook" "sgml" "DocBook" "B" "" "auto" "document,menu=export"
\format "eps" "eps" "EPS" "" "gv" "" "vector"
\format "fen" "fen" "FEN" "" "auto" "auto" ""
\format "fig" "fig" "FIG" "" "auto" "auto" "vector"
\format "gnumeric" "gnumeric" "Gnumeric spreadsheet" "" "" "auto" 
"document"
\format "agr" "agr" "Grace" "" "auto" "auto" "vector"
\format "beamer.info" "pdf.info" "Info (Beamer)" "" "" "auto" 
"document,menu=export"
\format "lilypond-book" "lytex" "LilyPond book (LaTeX)" "" "" "auto" 
"document,menu=export"
\format "literate" "nw" "NoWeb" "N" "" "auto" "document,menu=export"
\format "noteedit" "not" "Noteedit" "" "auto" "auto" "vector"
\format "pdf5" "pdf" "PDF (LuaTeX)" "u" "gv" "" 
"document,vector,menu=export"
\format "pdf4" "pdf" "PDF (XeTeX)" "X" "gv" "" 
"document,vector,menu=export"
\format "pdf3" "pdf" "PDF (dvipdfm)" "m" "open -a /Applications/Adobe\\ 
Acrobat\\ 9\\ Pro/Adobe\\ Acrobat\\ Pro.app" "" 
"document,vector,menu=export"
\format "pdf2" "pdf" "PDF (pdflatex)" "F" "open -a 
/Applications/Preview.app" "" "document,vector,menu=export"
\format "pdf" "pdf" "PDF (ps2pdf)" "P" "gv" "" 
"document,vector,menu=export"
\format "asciixfig" "asc" "Plain text (Xfig output)" "" "" "auto" ""
\format "asciichess" "asc" "Plain text (chess output)" "" "" "auto" ""
\format "asciiimage" "asc" "Plain text (image)" "" "" "auto" ""
\format "ps" "ps" "Postscript" "t" "gv" "" "document,vector,menu=export"
\format "tgif" "obj" "Tgif" "" "auto" "auto" "vector"
\format "dateout" "tmp" "date (output)" "" "" "auto" ""

#
# CONVERTERS SECTION ##########################
#

\converter "latex" "rtf" "latex2rtf -p -S -o $$o $$i" "needaux"
\converter "latex" "lyx" "tex2lyx -f $$i $$o" ""

#
# COPIERS SECTION ##########################
#
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