Strange network performance when using Time Machine with APE External HD

All -
I am still looking into a performance issue with TM and and an external HD on the APE.
Strangely the network activity changes from a more or less steady 200-400kb/sec to a pulsed 1-2Mb, and than a few seconds later back to 200-300kb.
I posted a few screenshots from the Activity Monitor here: http://gallery.mac.com/erwinhogeweg#100039
The RSSI is -32, and I have a 130Mb connection with the base station, but I am not even using 1% of this BW. The overall CPU load is about 40%, so it is completely mystery (to me) why this transfer rate is slow.
Is there anyone who can give some insight in this?
There is 107GB of data on my local HD. With about 2GB/hour, it will take 2 days to back this up to a n APE Time Machine drive...
Kind Regards,
Erwin

Do NOT use a USB hub with an APE...
I had two LaCie HDs, so I figure I connect them both with a USB hub. This was not a good idea. As soon as I removed the hub the network BW was at a steady 1-2Mb/s, with an occasional peak to 5Mb/s. Still way lower than the theoretical maximum, but hey, I guess you can't have it all.
Thanks,
Erwin

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JohnHusk wrote:
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pomme4moi wrote:
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