Why code completion using CEDET in Emacs so slow?

[Judeau]

I recently try KDevelop. It looks up for symbols (variables, function names,
class, struct...) much faster (instantly) than semantic-complete-self-insert
or M-Ret. Using M-Ret is faster, but it does not have nice format like other
IDEs, such as From nil > . In emacs, I must wait for at least ~1 sec, in
many cases, waiting for CEDET to look up all the header files in an included
header files, which takes very long.

I used auto complete clang, but it seems to have no speed improvement. Why
is that :( ? I love Emacs and all, and been using it for my C/C++ for almost
a year until I discover KDevelop. Using Emacs means code completion should
be trivial and optional? I really love this Emacs as an editor and as an
"IDE". I just want to find a way to improve this.

I notice that when performing auto complete, my disk got accessed a lot. Is
there a way to make the included files stored in memory for faster look up?
Or should CEDET implement this way?

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