Check out this excerpt from a techradar iPad Retina review. It may explain what's happening with your device.
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[Retina apps can be hungry as well, not for power but for storage space. Retina-friendly versions of apps can be significantly larger than non-Retina ones: Pages went from 95MB to 269MB, Numbers from 109MB to 283MB and iMovie from 70MB to 404MB. The difference isn't just higher resolution textures, icons and media, but there is a real danger that for graphically rich apps, Retina-friendly content could quickly overwhelm even the roomiest new iPad.
The problem is particularly annoying when an app uses pictures, such as JPEG images, to render text. Not only is that bad for accessibility - VoiceOver can't read it out, it can't be copied and so on - but it's bad for app size: the new iPad has four times the pixels of the iPad 2, and that means images need to be four times larger to look good.
That could be disastrous for apps such as some digital magazines, whose creators export the whole publication as a series of images. As Christopher Phin, editor of our Retina-friendly and distinctly un-bloated sister title Tap! explains, "If you're rasterising text to pixels rather than just letting it be text, your issues are going to bloat even more once you adopt Retina. If your issue is 650MB now, an issue built for Retina display could be 2.5GB."
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As Chris notes, apps will contain the graphics for both Retina and non-Retina displays, so that 650MB app could easily go past 3GB. Tap! doesn't use images to display text, and we sincerely hope other publications follow its lead. Otherwise there are going to be a lot of unhappy iPad owners out there.
Even if you don't subscribe to digital magazines, the Retina display could cause you some storage problems: videos and photos that have been optimised for previous iPads running 1024x768 resolutions don't look so good on the new iPad, and that means you'll have to decide whether upping the quality is worth sacrificing space for. If you think you'll be watching a lot of HD video or storing lots of high-resolution photographs, you might regret buying a new iPad with just 16GB of storage space.]
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Sent from my iPad using iPF