Innately, with a long-term business relationship, your QA team should become more efficient in testing just by the mere experience with your product and team. Over time, the testers get more comfortable with your product features. You and your testers learn the best modes of communication. Your experience enables you to focus on the most efficient processes for receiving and fixing bugs. Like any team, outsourced or in-house, management, development, and QA together build an efficient product development process through experience and adaptability. But that is not all you should expect.