xxx took too long, syntax highlighting disabled

I've found a pathological case where vim becomes almost unusable.

The trick is to open a file that's not really a Python file, but try to syntax highlight it and annotated with pyright errors as if it were Python code.

Note that syntax highlighting alone works well enough.

## Information

**VIM version**

```
VIM - Vi IMproved 9.1 (2024 Jan 02, compiled Aug 28 2024 20:08:35)
macOS version - arm64
Included patches: 1-700
Compiled by Homebrew
Huge version without GUI. Features included (+) or not (-):
+acl +cindent +cursorshape +file_in_path +job +menu +mouse_urxvt +popupwin +signs -tag_any_white +user_commands +windows
+arabic -clientserver +dialog_con +find_in_path +jumplist +mksession +mouse_xterm +postscript +smartindent -tcl +vartabs +writebackup
+autocmd +clipboard +diff +float +keymap +modify_fname +multi_byte +printer +sodium +termguicolors +vertsplit -X11
+autochdir +cmdline_compl +digraphs +folding +lambda +mouse +multi_lang +profile +sound +terminal +vim9script -xattr
-autoservername +cmdline_hist -dnd -footer +langmap -mouseshape -mzscheme -python +spell +terminfo +viminfo -xfontset
-balloon_eval +cmdline_info -ebcdic +fork() +libcall +mouse_dec +netbeans_intg +python3 +startuptime +termresponse +virtualedit -xim
+balloon_eval_term +comments +emacs_tags +gettext +linebreak -mouse_gpm +num64 +quickfix +statusline +textobjects +visual -xpm
-browse +conceal +eval -hangul_input +lispindent -mouse_jsbterm +packages +reltime -sun_workshop +textprop +visualextra -xsmp
++builtin_terms +cryptv +ex_extra +iconv +listcmds +mouse_netterm +path_extra +rightleft +syntax +timers +vreplace -xterm_clipboard
+byte_offset +cscope +extra_search +insert_expand +localmap +mouse_sgr +perl +ruby +tag_binary +title +wildignore -xterm_save
+channel +cursorbind -farsi +ipv6 +lua -mouse_sysmouse +persistent_undo +scrollbind -tag_old_static -toolbar +wildmenu
system vimrc file: "$VIM/vimrc"
user vimrc file: "$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: "/opt/homebrew/share/vim"
Compilation: clang -c -I. -Iproto -DHAVE_CONFIG_H -DMACOS_X -DMACOS_X_DARWIN -g -O2 -D_REENTRANT -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: clang -o vim -lm -lncurses -lsodium -liconv -lintl -framework AppKit -L/opt/homebrew/opt/lua/lib -llua5.4 -mmacosx-version-min=14.2 -fstack-protector-strong -L/opt/homebrew/opt/perl/lib/perl5/5.38/darwin-thread-multi-2level/CORE -lperl -L/opt/h
omebrew/opt/python@3.12/Frameworks/Python.framework/Versions/3.12/lib/python3.12/config-3.12-darwin -lpython3.12 -framework CoreFoundation -lruby.3.3 -L/opt/homebrew/Cellar/ruby/3.3.4/lib
```

## Reproducing the bug

Run a virualenv with pyright installed (maybe other tools like ruff of mypy would do as well).
Grab https://gist.github.com/dimaqq/925afea05590de55abd49ab631612738
Open it in vim.
Wait.
Wait some more...
Watch the screen fill in slowly with annotations.