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If my PNGs get compressed multiple times, do they need to be decompressed the same number of times?
I need my PNGs to load darn fast.

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up vote 6 down vote accepted

No, they will only need to be decompressed once, although I understand if you've had confusion with this as there are a number of tools like pngcrush that will try compressing the file many times to determine the most efficient strategy.

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Woah, good to know! Thank you! –  Vercas Jul 7 '11 at 11:45
    
If you like the answer, mark it, it helps us keep working through the questions. Thanks! :D –  Ruairi Fullam Jul 7 '11 at 11:46
    
You know, I can only accept an answer 15 minutes after asking the question. –  Vercas Jul 7 '11 at 11:47
    
Ah ok! I've only been here a few days. :) –  Ruairi Fullam Jul 7 '11 at 11:48

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