freeze/delay on paste with foldmethod=syntax

[jayk]

I have had this issue for some time and only just tracked down the config that causes it.

When I have vim-javascript enabled and set foldmethod=syntax enabled, any attempt to paste will freeze vim.

If I hit ctrl-c I can usually break out of it, but only part of the paste is present.

I thought it was an interaction with another plugin, but it turns out it just doesn't seem to like foldmethod=syntax

I've attached a minimal vimrc that triggers the problem.

What I did: Used the attached vimrc, Opened a javascript file, navigated to a line inside the existing javascript, hit i and attempted to paste some javascript into it.

What I expected: Javascript would be pasted into the file at the location.

What happened instead: Vim hangs until I hit ctrl-c.

I should note this is in konsole, In other terminal emulators it doesn't seem to hang entirely it just pastes slowly and the more text it inserts, the slower it goes. I've tried in lxterminal and cool-retro-term with the same results.

Vim version info:

VIM - Vi IMproved 9.1 (2024 Jan 02, compiled Oct 06 2024 20:33:49)
Included patches: 1-764
Compiled by Arch Linux
Huge version without GUI.  Features included (+) or not (-):
+acl               +file_in_path      +mouse_urxvt       -tag_any_white
+arabic            +find_in_path      +mouse_xterm       +tcl/dyn
+autocmd           +float             +multi_byte        +termguicolors
+autochdir         +folding           +multi_lang        +terminal
-autoservername    -footer            -mzscheme          +terminfo
-balloon_eval      +fork()            +netbeans_intg     +termresponse
+balloon_eval_term +gettext           +num64             +textobjects
-browse            -hangul_input      +packages          +textprop
++builtin_terms    +iconv             +path_extra        +timers
+byte_offset       +insert_expand     +perl/dyn          +title
+channel           +ipv6              +persistent_undo   -toolbar
+cindent           +job               +popupwin          +user_commands
-clientserver      +jumplist          +postscript        +vartabs
-clipboard         +keymap            +printer           +vertsplit
+cmdline_compl     +lambda            +profile           +vim9script
+cmdline_hist      +langmap           -python            +viminfo
+cmdline_info      +libcall           +python3/dyn       +virtualedit
+comments          +linebreak         +quickfix          +visual
+conceal           +lispindent        +reltime           +visualextra
+cryptv            +listcmds          +rightleft         +vreplace
+cscope            +localmap          +ruby/dyn          +wildignore
+cursorbind        +lua/dyn           +scrollbind        +wildmenu
+cursorshape       +menu              +signs             +windows
+dialog_con        +mksession         +smartindent       +writebackup
+diff              +modify_fname      -sodium            -X11
+digraphs          +mouse             -sound             +xattr
-dnd               -mouseshape        +spell             -xfontset
-ebcdic            +mouse_dec         +startuptime       -xim
+emacs_tags        +mouse_gpm         +statusline        -xpm
+eval              -mouse_jsbterm     -sun_workshop      -xsmp
+ex_extra          +mouse_netterm     +syntax            -xterm_clipboard
+extra_search      +mouse_sgr         +tag_binary        -xterm_save
-farsi             -mouse_sysmouse    -tag_old_static    
   system vimrc file: "/etc/vimrc"
     user vimrc file: "$HOME/.vimrc"
 2nd user vimrc file: "~/.vim/vimrc"
 3rd user vimrc file: "~/.config/vim/vimrc"
      user exrc file: "$HOME/.exrc"
       defaults file: "$VIMRUNTIME/defaults.vim"
  fall-back for $VIM: "/usr/share/vim"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -g -ffile-prefix-map=/build/vim/src=/usr/src/debug/vim -flto=auto -D_REENTRANT -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 
Linking: gcc -Wl,-E -Wl,-rpath,/usr/lib/perl5/5.40/core_perl/CORE -Wl,-O1 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro -Wl,-z,now -Wl,-z,pack-relative-relocs -flto=auto -L/usr/local/lib -o vim -lm -ltinfo -lacl -lattr -lgpm -L/usr/lib -ltclstub8.6 -ldl -lz -lpthread -lm 

vimrc-breaks-vim-javascript.txt

[jayk]

This is a paste with the keyboard (ctrl-shift-v), not a vim yank/paste.

[amadeus]

The syntax foldmethod is know to be really bad performance-wise in vim. I think some people often suggest that if you want to use that foldmethod, setup an autocommand to set foldmethod to manual when in insert mode, and then when you go back to normal mode, set it to syntax

[jayk]

Thanks. I disabled it and everything works fine. I rarely use it anyway, but I thought I should drop an issue since it does seem to hang vim entirely when both it and vim-javascript are enabled. If nothing else it might be worth an addition to the docs, It drove me crazy for months before I finally tracked down where the interaction was.