Code completion with C/C++ extension #4890

Hi,
I've been testing the new C/C++ extension, however I am running into some problems with code completion suggestions.

Here is an example with C/C++ extension installed, forcing suggestions using cmd+space.
It results in perpetual "Loading..." pop up:

With the extension uninstalled, the suggestions show up immediately

The features like go to symbol and go to definition are working properly with the extension installed,
however it seems to hinder the code completion.

• VSCode Version: 0.10.11
• OS Version: El Captain (OS X 10.11.4 )