The feature y'all are discussing (or not) is called Dynamic Rate Scaling, and it is one of the features of the WiFi specs which make it so useful. Basically, as one moves farther from an AP, or by some other means has the signal strength lowered, e.g. dense walls, etc. the drivers of the devices will lower the speed at which they send data in incremental steps so as to achieve the best throughput. I'm not sure how to find this speed on an iPad, but on a Mac one may simply Option-click the wireless icon and it will show the current TX speed for the Mac side of the equation (I'd include a screenie, but I don't think they are allowed here). Mine is currently 145Mbps (802.11n).
Of course, that is the speed between my Mac and the AP, the speed of the Internet is limited by the ISP, and is often significantly lower.
RB
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Posted by: Rampant Badger <badger@rampantbadger.com>
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