I would suggest opening a terminal and running a few tracerts to see what latancy is like. Or tether to your pc and see what happens or run tracerts from a command prompt.
Latency on 4g is way better than 3g/cellular.
You have to remember unless you are moving in a car there is no handoff between towers. Although you could be in the outlying edges of a town but that is back
The same is not true for cellular where you can be transfered thru countless towers to get back to a POP.
I am, or rather the company i work for is, a distributor of microwave radios, both licensed and unlicensed, and 2.5Ghz and 3.65Ghz WiMax and I actually distribute the E-Band radios Clearwire uses for backhaul on their 4G networks (because they dropped Dragonwave like a psycho girlfriend) and i also help in the design and trouble shooting, and I can tell you with absolute certainty that latency is not an issue with clearwires networks unless it is oversold too heavily (which they are). Then the radio is working too hard and, well that's what happens.
But to say 4g is slower than 3g is telling me that the network is overloaded or the radios are not setup properly (you are getting a lower QOS priority)... or... you may need to make sure you have the latest radios installed or as you guys are eluding too, maybe a rom issue
One thing people don't realize is that these 2.5Ghz radios have very limited bandwidth. Clearwire and Sprint have greatly over exaggerated these radios capabilities for the most part.
But again I think its the network not the rom although a funky rom can scew up a lot of things
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