auto complete in C/C++ project is very slow

[chengyi]

I use company in my C/C++ project, But the tips popup window shows very slow and sometimes doesn't show at all.
is it required some additional config?

[phinicota]

Same here. Haven't found a solution and stopped using auto-complete all together but I'd like to know if a solution exists.

[kzjeef]

Have same problem here too.

When I open more and more files in buffers, typing is too slow to typing.

[kzjeef]

I think i found the cause,
after debugging company 's backend, I the lag is caused by company clang backend,
which enabled by c-c++ layer.

after disable c-lang support in that layer, the typing is very smooth now.

Hope this helpful, maybe it's should fire a bug to c-c++ layer's clang support.

btw, you can type
company-diag to check the information about company backend.

[chengyi]

@kzjeef In fact, you must pass the ccorrect compiler params through .clang_complete file.
so company will show correct tips with clang backend.

[deb0ch]

Now you can also use the ycmd layer as an alternative, which has the reputation of being much faster than company-clang, and is asynchronous.