I think it is a kind of a traffic shaping via Amazon's proxies. Don't forget - this is a 'free' unlimited 3G traffic, not guaranteed speed and even it is not guaranteed ever and is still in beta and is somewhat unsupported for web browsing and downloading files other than ebooks from the Kindle store. Add for this unoptimised code for web browser in K2i. Yes, my old old Siemens M65 with GPRS renders web pages faster but I'd paid the traffic. "3G" is very common abbreviature - it just means 3G modem, not 3G speed, also K2i doesn't have HSDPA as far as I know. But main thing is the Amazon proxies.
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