Please improve the performance. about nerdtree HOT 6 OPEN

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@jinleileiking interesting results, May I ask what other plugins are there in your config other than NERDTree? For example vim-devicons or the nerdtree-git-plugin? and may I have your profiling options?
This call takes a bunch of time because of being in a loop and getting called for every child node, I suspect that the actual bulk of the work happens in this line in the lib/nerdtree/path.vim line 664:

" FUNCTION: Path.refreshFlags(nerdtree) {{{1
function! s:Path.refreshFlags(nerdtree)
    call g:NERDTreePathNotifier.NotifyListeners('refreshFlags', self, a:nerdtree, {})
    call self.cacheDisplayString()
endfunction

Call to the refreshFlags listeners is for third-party plugins, for example, vim-devicons and nerdtree-git-plugin which update their internal state via this event. So the cost of each extra plugin is O(n).

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You can also try using #1362, Setting g:NerdTreeLazyDirRefresh to 1 enables the lazy refresh functionality. In this mode, we don't refresh closed directories, We just mark them as dirty and refresh them once it is necessary.

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Plug 'PhilRunninger/nerdtree-buffer-ops'

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It seems this plugin cost a lot of CPU. I disable this plugin, works well

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@jinleileiking I'm happy to hear that you've found the issue, Since it probably wasn't the original author's problem I'll leave this open.

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