Is it normal fold enable is very slow ?

[nda-cunh]

when i enable fold my vim is very slow , is it normal ? (vim-language-server)

[cagledw]

I recently started using vim-lsp and see that same thing. My simple use case:

1. Open First Python File (buffer_1 @ 1025 lines)
2. Open 2nd Python File in same window, (buffer_2 @ 1715 lines)
3. Return to buffer_1 [b#]- elapsed time 13+ SECONDS

FUNCTION  lsp#ui#vim#folding#foldexpr()
    Defined: ~\vimfiles\vim-lsp\autoload\lsp\ui\vim\folding.vim:115
Called 4649 times
Total time:  13.229189
 Self time:   0.119559

count  total (s)   self (s)
 4649   0.551164   0.013031     let l:servers = s:find_servers()
                            
 4649              0.007785     if len(l:servers) == 0
                                    return
 4649              0.001982     endif
                            
 4649              0.009021     let l:server = l:servers[0]
                            
 4649              0.015245     if has('textprop')
                                    " Does the current line have a textprop with original line info?
 4649   0.090418   0.017451         let l:textprop_line = s:get_textprop_line(v:lnum)
                            
 4649              0.005292         if l:textprop_line == -1
                                        " No information for current line available, so use indent for
                                        " previous line.
                                        return '='
 4649              0.002158         else
                                        " Info available, use foldexpr as it would be with original line
                                        " number
 4649  12.520873   0.022345             return s:foldexpr(l:server, bufnr('%'), l:textprop_line)
                                    endif
                                else
                                    return s:foldexpr(l:server, bufnr('%'), v:lnum)
                                endif