It's that my brother seems to keep wanting to play this one game and to a point where he goes about doing some editing (it's a WWE game by the way). It tends to freeze after he gets done doing editing this one created wrestler. In other words I can say he tends to be obsessed playing that game a lot.
Its not just your PS3 TC. I own both a 360 and PS3, and notice that the PS3 downloads much slower than my 360.
It's the way the systems handles downloads. 360 preloads downloads and they're downloaded from a file that's already been partially downloaded, server side. Plus MS limits the amount of size that each update can be.