Timout for Code completion popup

Make a option to specify a timeout after which code completion window pops up. Reason: If you are working with a very large project with very complex classes (Many methods, deep inheritance tree) the code completion can become very slow.

I can't supply you with actual code cause it's a internal project, but you can watch the same behavior when using another project which has very complex classes like the GtkMM Project. Test out the following code:

#include <gtkmm.h>

int main( int argc, char **argv )
{
    Gtk::Main kit( argc, argv );
    Gtk::Window win( Gtk::WINDOW_TOPLEVEL );

    win.show();
    kit.run();
}

When typing the "win.show()" line you can clearly see a lag of about 1-2 seconds on a decent machine until the code completion pops up. If you know your classes well and have the option to make a timeout for the popup it would make working with Qt Creator more efficient (IMHO Qt Creator is even with this behavior the most efficient IDE out).