Sluggish vim in insert mode on WSL while having auto-pairs plugin loaded for Markdown files

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#4,985 opened on May 31, 2025 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 35/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: vim
Domain: devtools, performance

Research direction

Start with the minimal vimrc shown in the issue and run vim README.md under Ubuntu 24.04.2 on WSL2, using the supplied :ALEInfo output as context. Compare insert-mode responsiveness with auto-pairs and ALE loaded versus without them, then trace the relevant interaction. Done means Markdown editing is responsive in the reported WSL setup without breaking the plugin combination.

Written by the indexing model from the issue text.

Description

bug

Information

VIM version

VIM - Vi IMproved 9.1 (2024 Jan 02, compiled Apr 01 2025 20:12:31)
Included patches: 1-16, 647, 678, 697

Operating System: Ubuntu 24.04.2 LTS on Windows 11 WSL2

What went wrong

Vim gets really sluggish in insert mode if jiangmiao/auto-pairs plugin is loaded. Only happens in WSL. Seems to only apply to Mardown (.md) files.

See jiangmiao/auto-pairs#378.

Reproducing the bug

vimrc contents with junegunn/vim-plug loaded plugins

call plug#begin()
Plug 'dense-analysis/ale'
Plug 'jiangmiao/auto-pairs'
call plug#end()

vim README.md
Sluggish in insert mode

:ALEInfo

Expand

Current Filetype: markdown Available Linters: ['alex', 'cspell', 'languagetool', 'markdownlint', 'marksman', 'mdl', 'proselint', 'pymarkdown', 'redpen', 'remark_lint', 'textlint', 'vale', 'writegood'] Linter Aliases: 'remark_lint' -> ['remark-lint'] 'writegood' -> ['write-good'] Enabled Linters: ['alex', 'cspell', 'languagetool', 'markdownlint', 'marksman', 'mdl', 'proselint', 'pymarkdown', 'redpen', 'remark_lint', 'textlint', 'vale', 'writegood'] Ignored Linters: [] Suggested Fixers: 'dprint' - Pluggable and configurable code formatting platform 'pandoc' - Fix markdown files with pandoc. 'prettier' - Apply prettier to a file. 'remark-lint' - Fix markdown files with remark-lint 'remove_trailing_lines' - Remove all blank lines at the end of a file. 'textlint' - Fix text files with textlint --fix 'trim_whitespace' - Remove all trailing whitespace characters at the end of every line.

Linter Variables:
let g:ale_markdown_markdownlint_executable = 'markdownlint'
let g:ale_markdown_markdownlint_options = ''
let g:ale_markdown_marksman_executable = 'marksman'
let g:ale_markdown_mdl_executable = 'mdl'
let g:ale_markdown_mdl_options = ''
let g:ale_markdown_pymarkdown_auto_pipenv = 0
let g:ale_markdown_pymarkdown_auto_poetry = 0
let g:ale_markdown_pymarkdown_auto_uv = 0
let g:ale_markdown_pymarkdown_executable = 'pymarkdown'
let g:ale_markdown_pymarkdown_options = ''
let g:ale_markdown_pymarkdown_use_global = 0
let g:ale_markdown_remark_lint_executable = 'remark'
let g:ale_markdown_remark_lint_options = ''
let g:ale_markdown_remark_lint_use_global = 0
let g:ale_markdown_vale_executable = 'vale'
let g:ale_markdown_vale_input_file = '%t'
let g:ale_markdown_vale_options = ''

Global Variables:
let g:ale_cache_executable_check_failures = v:null
let g:ale_change_sign_column_color = v:false
let g:ale_command_wrapper = v:null
let g:ale_completion_delay = v:null
let g:ale_completion_enabled = v:false
let g:ale_completion_max_suggestions = v:null
let g:ale_disable_lsp = 'auto'
let g:ale_echo_cursor = v:true
let g:ale_echo_msg_error_str = 'Error'
let g:ale_echo_msg_format = '%code: %%s'
let g:ale_echo_msg_info_str = 'Info'
let g:ale_echo_msg_warning_str = 'Warning'
let g:ale_enabled = 1
let g:ale_fix_on_save = v:false
let g:ale_fixers = {}
let g:ale_history_enabled = v:true
let g:ale_info_default_mode = 'preview'
let g:ale_history_log_output = v:true
let g:ale_keep_list_window_open = 0
let g:ale_lint_delay = 200
let g:ale_lint_on_enter = v:true
let g:ale_lint_on_filetype_changed = v:true
let g:ale_lint_on_insert_leave = v:true
let g:ale_lint_on_save = v:true
let g:ale_lint_on_text_changed = 'normal'
let g:ale_linter_aliases = {}
let g:ale_linters = {}
let g:ale_linters_explicit = v:false
let g:ale_linters_ignore = {}
let g:ale_list_vertical = v:false
let g:ale_list_window_size = 10
let g:ale_loclist_msg_format = '%code: %%s'
let g:ale_max_buffer_history_size = 20
let g:ale_max_signs = -1
let g:ale_maximum_file_size = v:null
let g:ale_open_list = v:false
let g:ale_pattern_options = v:null
let g:ale_pattern_options_enabled = v:null
let g:ale_root = {}
let g:ale_set_balloons = v:false
let g:ale_set_highlights = v:true
let g:ale_set_loclist = v:true
let g:ale_set_quickfix = v:false
let g:ale_set_signs = v:true
let g:ale_sign_column_always = v:false
let g:ale_sign_error = 'E'
let g:ale_sign_info = 'I'
let g:ale_sign_offset = 1000000
let g:ale_sign_style_error = 'E'
let g:ale_sign_style_warning = 'W'
let g:ale_sign_warning = 'W'
let g:ale_sign_highlight_linenrs = v:false
let g:ale_type_map = {}
let g:ale_use_neovim_diagnostics_api = v:false
let g:ale_use_global_executables = v:null
let g:ale_virtualtext_cursor = 'all'
let g:ale_warn_about_trailing_blank_lines = v:true
let g:ale_warn_about_trailing_whitespace = v:true

Command History:

(executable check - failure) alex
(executable check - failure) cspell
(executable check - failure) languagetool
(executable check - failure) markdownlint
(executable check - failure) marksman
(executable check - failure) mdl
(executable check - failure) proselint
(executable check - failure) pymarkdown
(executable check - failure) redpen
(executable check - failure) remark
(executable check - failure) textlint
(executable check - failure) vale
(executable check - failure) write-good

Dominant language: Vim Script
Stars: 14k
Forks: 1.5k
PR merge metrics: No merged PRs in 30d

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Sluggish vim in insert mode on WSL while having auto-pairs plugin loaded for Markdown files

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Assessment

Research direction

Description

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What went wrong

Reproducing the bug

:ALEInfo

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