I noticed this in the last week or so and I think its related to some updates released to debian lenny, but I'm not sure. At first I thought it was the last few SVN releases, so I went back to some older mid-march releases and it still did the same thing. I just noticed its directly related to large files because when i stopped the download, the CPU usage went back to normal (3~10%). I cant really narrow it down any more than that and the debug log isnt showing anything that could be related to that, at least as far as I can tell. I'm not sure what I can do to fix it though... Any insight?