[nznog] ADSL Rate Limiting on the line.

Hi guys, Reading todays article on http://www.aardvark.co.nz/ he raves on about 'increased latency' Would I be right in saying the latency would only increase on lower speed jetstream plans - as it takes longer for the packets to pass over a smaller pipe. Why is he talking about it increasing latency on full rate jetstream plans? Cheers