I admit with regards to bandwidth I'm often in the minority. Certainly battery life is a huge issue with any kind of polling. Personally, I think it's really important to minimise bandwidth as much as possibly, because you don't necessarily know how your user is paying for it. It would not be unknown for some (foolish?) users to be paying $10+ per megabyte in certain countries/carriers. In the case I mentioned, we were talking about a fairly hefty XML file (which I neglected to mention).
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I admit with regards to bandwidth I'm often in the minority. Certainly battery life is a huge issue with any kind of polling. Personally, I think it's really important to minimise bandwidth as much as possibly, because you don't necessarily know how your user is paying for it. It would not be unknown for some (foolish?) users to be paying $10+ per megabyte in certain countries/carriers. In the case I mentioned, we were talking about a fairly hefty XML file (which I neglected to mention).