ccomplete#Complete very slow on large tags file

Hi,

I am using the built-in ccomplete#Complete omnifunc for tags-based
completion. It works pretty well with a small or medium sized project.
But on larger projects like Linux or U-Boot, the tags file is pretty big
(~650k lines/70 for U-Boot and ~4.8 mil lines/630MB for Linux).

On these projects, especially Linux, if I use ccomplete, completion
takes a huge amount of time. And since the completion is synchronous,
vim just freezes up for that time and I have to wait for the completion
results to show up. On Linux the wait times can go more than a minute on
my modest quad core 4th gen i7 and a SATA SSD.

So, I intend to set aside some time and try to speed up the completion
and make it asynchronous. I haven't read or written much vimscript so I
don't expect it to be easy or quick. So before I do that, I'd like to
know if anyone here attempted this before.

If someone did succeed, could you please point me to the optimized
version? If someone tried but failed, could you please let me know where
you had trouble? Is it that the ctags format just not suitable for large
projects? Is there some limitation with vim that makes it impossible? Is
it something else entirely?

--
Regards,
Pratyush Yadav

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