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Using Atlas has better performance then Spritesheets?


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Memory use is to do with the texture dimensions, not if they are a sprite sheet or an atlas - they are just an image at the end of the day, the frame data has no bearing on the gpu memory.


Keeping to power of two textures is sensible, yes, as the GPU will round-up your image anyway. So if you've got an image that is 513px wide it will round that up to 1024px, so it will use more memory. It's just good practise to try and keep to pot sizes, but not essential - really depends on the game, quantity of assets, etc.

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