You hear it all the time, but it is especially important for Groove users: defragment your hard drive.  It is no secret to Groove users – particularly those that use it often – that Groove stores a lot of data.  One way to improve performance while using Groove is to keep your hard drive defragmented.  In doing so, you will keep the databases that store your Groove data more contiguous on disk, leading to reduced disk I/O and better overall response time.