Too slow code completion (clang)
There are problem in clang code completion. When I write object name and "." or "->"(for pointer to object) I will see some options (methods, properties, etc). But I have very big delay (3...5 seconds or more) between write "." or "->" and appearance of relevant results. I can see in sources of clang plugin that some async operations started (*_populate_async), next there are big delay before callback called.