Very slow on save - 20-30 seconds about vimwiki HOT 4 CLOSED

Do you use the last stable version of Vimwiki or the version from the dev branch? The stable version didn't change in the last few weeks. In the dev branch I added the automatic generation of the table of contents, but it is disabled by default and shouldn't take 20 seconds. So, check the values of g:vimwiki_auto_export and g:vimwiki_auto_toc.
For further inspectation, check which plugins set an autocommand that execute when you write a buffer: :au BufWrite, :au BufWritePre, :au BufWritePost, :au BufWriteCmd

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I use Vundle to manage plugins. I do not remember exactly the last time I ran :BundleUpdate, but I am probably on the stable branch of vimwiki because I did not deliberately target the dev branch. I'm on vimwiki 2.1

g:vimwiki_auto_export and g:vimwiki_auto_toc are unset

I don't have any Buf* autocmds that run for vimwiki buffers.

Again, this may not be a problem that vimwiki itself is causing, but I'm really stumped for techniques to track down the cause. I want to benchmark/log the sequence of events when I save (a la vim --startuptime) but don't know how.

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You can watch which functions of any Vim scripts are called by using profile: :profile start logfile and then :profile func *, which logs the execution of every called script function in the file "logfile".
But a probably easier approach is plugin bisecting: remove half of your plugins and see if the issue is still present. If no, the problematic plugin is among the ones you removed, if yes, it's in the other half. Continue until you found the problematic plugin.

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Feel free to reopen if the issue persists.

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