coc.nvim
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neoclide
Noticeable delay found between pressing a key and the key appears when using coc on GVim+Windows
Result from CocInfo
## versions
vim version: VIM - Vi IMproved 9.1 9011336
node version: v22.14.0
coc.nvim version: 0.0.82-317e12e 2025-04-22 23:46:55 +0800
coc.nvim directory: C:\Users\Linwei\.vim\bundles\coc.nvim
term: undefined
platform: win32
## Log of coc.nvim
2025-04-29T08:26:22.813 INFO (pid:32564) [extension:coc-git] - Looking for git in: git
2025-04-29T08:26:22.865 INFO (pid:32564) [plugin] - coc.nvim initialized with node: v22.14.0 after 407
2025-04-29T08:26:22.928 INFO (pid:32564) [attach] - receive notification: highlight []
2025-04-29T08:26:27.162 INFO (pid:32564) [services] - LanguageClient clangd state change: stopped => starting
2025-04-29T08:26:27.168 INFO (pid:32564) [language-client-index] - Language server "languageserver.clangd" started with 36740
2025-04-29T08:26:27.241 INFO (pid:32564) [services] - LanguageClient clangd state change: starting => running
2025-04-29T08:26:27.245 INFO (pid:32564) [services] - service languageserver.clangd started
2025-04-29T08:26:27.916 INFO (pid:32564) [attach] - receive notification: highlight []
2025-04-29T08:26:29.282 INFO (pid:32564) [attach] - receive notification: highlight []
2025-04-29T08:26:30.439 INFO (pid:32564) [attach] - receive notification: highlight []
2025-04-29T08:26:30.930 INFO (pid:32564) [attach] - receive notification: highlight []
2025-04-29T08:26:31.280 INFO (pid:32564) [attach] - receive notification: highlight []
2025-04-29T08:26:36.225 INFO (pid:32564) [attach] - receive notification: highlight []
2025-04-29T08:26:39.423 INFO (pid:32564) [attach] - receive notification: showInfo []
Describe the bug
coc.nvim becomes laggy and unresponsive recently. when typing in the INSERT mode, noticeable delay can be found between pressing a key and the key got displayed.
profiling result:
FUNCTIONS SORTED ON TOTAL TIME
count total (s) self (s) function
95 0.799562 0.004507 coc#api#Notify()
3010 0.789035 0.010764 coc#api#Call_function()
55 0.770976 0.007344 coc#pum#create()
49 0.752534 0.011832 coc#float#create_float_win()
49 0.410253 0.000882 <SNR>271_add_highlights()
49 0.409371 0.086863 coc#highlight#add_highlights()
49 0.320396 coc#float#create_buf()
9984 0.320359 0.156573 coc#highlight#add_highlight()
28 0.151526 <lambda>5598()
25 0.151499 0.000101 <lambda>5599()
9984 0.116513 0.011247 coc#api#Buf_add_highlight()
9984 0.101115 0.022556 coc#api#Buf_add_highlight1()
2 0.084548 0.000096 ale#Queue()
2 0.084259 0.000143 <SNR>246_Lint()
2 0.083343 0.000045 ale#engine#RunLinters()
2 0.083235 0.000104 <SNR>368_GetLintFileValues()
2 0.083084 0.000125 <SNR>368_RunLinters()
4 0.082641 0.000061 <SNR>368_RunLinter()
678 0.080753 0.016497 Vim_NeatTabLabel()
9984 0.071350 coc#api#CreateType()
FUNCTIONS SORTED ON SELF TIME
count total (s) self (s) function
49 0.320396 coc#float#create_buf()
9984 0.320359 0.156573 coc#highlight#add_highlight()
28 0.151526 <lambda>5598()
49 0.409371 0.086863 coc#highlight#add_highlights()
9984 0.071350 coc#api#CreateType()
678 0.064256 Vim_NeatBuffer()
8 0.042161 0.042022 ale#engine#IsExecutable()
10033 0.048736 0.040614 coc#compat#call()
9984 0.101115 0.022556 coc#api#Buf_add_highlight1()
39 0.020578 <SNR>266_BufferText()
1 0.017439 0.017373 <SNR>260_request()
678 0.080753 0.016497 Vim_NeatTabLabel()
7 0.018242 0.016216 sy#repo#get_diff()
4 0.015566 0.015497 ale#job#Start()
2 0.016403 0.015349 <SNR>281_get_matching_delims()
5 0.016480 0.014493 <SNR>259_Call()
353 0.014963 0.014224 <SNR>260_notify()
57 0.018403 0.011851 <SNR>281_get_delim()
49 0.752534 0.011832 coc#float#create_float_win()
9984 0.116513 0.011247 coc#api#Buf_add_highlight()
Reproduce the bug
We will close your issue when you don't provide minimal vimrc and we can't reproduce it
- Create file
mini.vimwith：
set nocompatible
set runtimepath^=D:/vim/plugins/coc.nvim
filetype plugin indent on
syntax on
set hidden
set updatetime=300
set signcolumn=yes
let g:coc_config_home = expand('~/.vim')
if !isdirectory(g:coc_config_home)
silent! call mkdir(g:coc_config_home)
endif
inoremap <silent><expr> <TAB>
\ coc#pum#visible() ? coc#pum#next(1) :
\ <SID>check_back_space() ? "\<TAB>" :
\ coc#refresh()
inoremap <expr><S-TAB> pumvisible() ? coc#pum#prev(1) : "\<C-h>"
function! s:check_back_space() abort
let col = col('.') - 1
return !col || getline('.')[col - 1] =~# '\s'
endfunction
if has('nvim')
inoremap <silent><expr> <c-space> coc#refresh()
else
inoremap <silent><expr> <c-@> coc#refresh()
endif
nmap <silent> [g <Plug>(coc-diagnostic-prev)
nmap <silent> ]g <Plug>(coc-diagnostic-next)
nmap <silent> gd <Plug>(coc-definition)
nmap <silent> gy <Plug>(coc-type-definition)
nmap <silent> gi <Plug>(coc-implementation)
nmap <silent> gr <Plug>(coc-references)
autocmd CursorHold * silent call CocActionAsync('highlight')
nmap <leader>rn <Plug>(coc-rename)
xmap <leader>f <Plug>(coc-format-selected)
nmap <leader>f <Plug>(coc-format-selected)
augroup MyCoCEventGroup
autocmd!
autocmd FileType typescript,json setl formatexpr=CocAction('formatSelected')
autocmd User CocJumpPlaceholder call CocActionAsync('showSignatureHelp')
augroup end
xmap <leader>a <Plug>(coc-codeaction-selected)
nmap <leader>a <Plug>(coc-codeaction-selected)
nmap <leader>ac <Plug>(coc-codeaction)
nmap <leader>qf <Plug>(coc-fix-current)
xmap if <Plug>(coc-funcobj-i)
xmap af <Plug>(coc-funcobj-a)
omap if <Plug>(coc-funcobj-i)
omap af <Plug>(coc-funcobj-a)
xmap ic <Plug>(coc-classobj-i)
omap ic <Plug>(coc-classobj-i)
xmap ac <Plug>(coc-classobj-a)
omap ac <Plug>(coc-classobj-a)
nmap <silent> <TAB> <Plug>(coc-range-select)
xmap <silent> <TAB> <Plug>(coc-range-select)
command! -nargs=0 Format :call CocAction('format')
command! -nargs=? Fold :call CocAction('fold', <f-args>)
command! -nargs=0 OR :call CocAction('runCommand', 'editor.action.organizeImport')
set statusline^=%{coc#status()}%{get(b:,'coc_current_function','')}
nnoremap <silent> <space>a :<C-u>CocList diagnostics<cr>
nnoremap <silent> <space>e :<C-u>CocList extensions<cr>
nnoremap <silent> <space>c :<C-u>CocList commands<cr>
nnoremap <silent> <space>o :<C-u>CocList outline<cr>
nnoremap <silent> <space>s :<C-u>CocList -I symbols<cr>
nnoremap <silent> <space>j :<C-u>CocNext<CR>
nnoremap <silent> <space>k :<C-u>CocPrev<CR>
nnoremap <silent> <space>p :<C-u>CocListResume<CR>
let g:coc_snippet_next = '<tab>'
imap <m-l> <Plug>(coc-snippets-expand)
vmap <m-j> <Plug>(coc-snippets-select)
let g:coc_snippet_next = '<m-j>'
let g:coc_snippet_prev = '<m-k>'
let g:coc_snippet_next = '<tab>'
-
Start (neo)vim with command:
vim -u mini.vim -
Operate vim.
Screenshots (optional)
coc.nvim version: 0.0.82-317e12e 2025-04-22 23:46:55 +0800
Upgrade to latest release, chemzqm were working on performance improvements on Vim9 this month.
Have you enabled semanticTokens.enable? Clangd server will produce lots of tokens to highlight, disable the semanticTokens highlighting, or increase g:coc_highlight_maximum_count and try again.
Seems caused by too many highlights with coc#highlight#add_highlights, can you test if using configuration "suggest.enableFloat": false or "suggest.autoTrigger": "none" helps?
Will try when I come back from my holidays, right now I haven't got my laptop with me.