Datarate fluctuates as per the size of your pipe. If you have a T1 connection (like myself) you would be best off at the 10.0 rate level. However if you are just a cable or DSL user, the maximum useage would probably be around 7.5-8.0. Note that you could set it higher, but it would not increase performance at all unless you upgraded your connection.
and for the record i believe Datarate only goes to 10, so you couldn't set it for 100 as the original poster suggested.
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