I don't know. What specific cpu speeds?
On my system a P4 2.8ghz 1gb ram the cpu usage is around 30% for a upload (10,474.2 KB/s) and around 50% for download (9,578.5 KB/s) via my 100mbit lan.
If you enable transfer speed limiting the cpu usage drops a huge amount. when speed limiting is enabled a different approach is taken which uses less cpu at the expense of speed. normal transfers try to achieve the fastest possible transfer regardless of cpu usage.
These results were without first defragmenting the hard drive, both systems could use a defragment.
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