What's the best way to create zoomable map for iOS by using Flash?

We got a big location map that allows user to zoom in and out and do the panning but the image of the map is not very smooth when you  pan it in iOS (Android is ok) so is there a way to fix this problem?
thanks!

Which one you use might depend on the nature of the picture, like, a picture with lots of flat colored areas will come out a lot smaller as a lossless PNG than as a 100% JPEG. It would be interesting to try an 8 bit or 16 bit PNG, see if that makes it use less GPU memory. JPEG is usually 24 bit, and it or a 24 bit PNG should take the same amount of GPU memory.
There is a chance that AIR is using 32 bit throughout on iOS, so it won't matter what the original image was if that's the case, just the width and height would determine the amount used.
The smoothing setting is more about whether you're going to scale the image, which I guess you would be if you want the image to be scaled down. If you could have a smaller version that the user then touches to go immediately to the larger version, both could be set to have no smoothing, which may improve performance.

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