Part of the fast speed and then the drop could be caused by their "speed boost". It gives you a fast burst of speed to start off a download but then slows down after that. I have noticed the same thing as well. expecially if i'm trying to apt-get during supposed "peak" times. you are not alone.

On Sun, May 24, 2009 at 10:45 PM, Michael Butash <michael@butash.net> wrote:
Hi all,

 I'm curious, has anyone seen speed issues with cox lately or in about
the past 6 months in general?  I ask, because I have a completely
reproducible issue, where with ubuntu, doing an apt-get of any server,
on any mirror around the world, I get all downloads that start very
fast, and throttle down to nothing after a few seconds.  Restarting it
goes fast, then slows like clockwork, literally to kb/s or nothing.
Same behavior occurs with FTP protocol for the apt-get's as well.  P2P,
usenet, other bandwidth leeching methods work just fine, just anything
with static/single/long-term tcp flow connections seems to be affected.
I tried this from different modems on different regional nodes, and same
thing.  I'm thinking im not the only one with this, and feels a lot like
buffering/queuing (problems) in their network.

 A little birdy in the know told me this is could be a more rampant
issue due to updates in the cox cable network, but I'd like to have some
other consensus/input before making an issue of it.  Most windows users
I've talked to seem oblivious to it, but I figure I'd ask others that
might use linux the same way.  I don't use windoze enough to know.

-mb

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Kenny McHenry