Idk how to do it but seems like Python takes too long to get contacts via API.Maybe we can catch contacts to the another file on registration part.Because accounts part of Wazapp didn't written with Python .And client can read the names and other information from a file , not from dbus.

But this time people have to register after adding a new contact.But i think devs can find a solution for that Btw it's just an idea ...