ah but...
I just hit this problem as well, except it was the System process that was taking more than its fair share. Seeing crazy upload speeds too, more than theoretically possible.
I checked out the command prompt FTP client in XP, and it did exactly the same thing.
Only thing to have changed since it was working fine? Installled Kerio Personal Firewall.
So, I uninstalled that and it now works fine again.
I'm assuming an inneficiency in their scanning engine, their forums (if applicable) is my next stop.
So - anyone else having problems with high upload cpu usage - try the command prompt client first.
That winsock fix thing didn't work for me, waste of time.
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