... I have noticed the more services I have enabled, (P2P, NFS, AFS, etc) the more it can affect the fluctuation of these speeds (always negatively). I try to limit the enabled services to FTP, and only enable the others when I need them, and then disable them as soon as I am done with whatever task I needed them for.
All true. Many of the services on this device increase overhead and reduce performance. Users should be mindful of this fact and only enable the services they are using on a regular basis. Just enabling UPnP alone (on other ShareCenter devices I've used) has a measurable performance impact.