Hah! I was fished-in.

Well, here's the thing: I'm using a solid-state MU for my gamertag and running my library from the HDD, and it is dog ass slow. If it's referring to a download history, checking licenses, or something like that, I can see how it would be slow no matter what. But it's not like an HDD is going to be stunningly faster than an HDD when dealing with a paltry amount of data.
spoiler (click to show/hide)
I got to use "paltry" in a sentence. My day is complete!