Re: ccomplete#Complete very slow on large tags file

[I did not receive the original mail, so answering to Tonys mail, please
keep the list on CC]

On Mi, 01 Apr 2020, Tony Mechelynck wrote:

> > Yes, the tags file is sorted and vim is built with +tag_binary and
> > 'tagbsearch' is on. The tags file wasn't case-folded sorted, but I tried
> > with that too and I see similar performance.
> >
> > Anyway, just to remove any potential confusion, jumping to tags via
> > 'CTRL-]' is blazing fast. So is listing all alternatives with 'g]'. Does
> > ccomplete use the same mechanism for searching tags file as those two?
> > If so, then I wonder why it is so much slower.

Hm, I had a quick look at ccomplete.vim. It not only does a tag search,
but also searches the current file and more importantly, it might call
:vimgrep and :vimgrep is known to be slow if many files have to be
searched. Not sure if there is anything to improve, perhaps adding a
switch to only do tag completion would already help?

Anyhow, first please create a vimscript profile, so we can exactly see
when it is slow. See :h :profile and this stackoverflow answer:
https://stackoverflow.com/a/12216578/789222

Perhaps this can share some more light on the slowness.

Thanks,
Christian
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