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If I save images in Photoshop with progressive property, are these images progressively downloaded by the browsers ?

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Yes. That was the reason for the progressive property in the first place. At one time browsers ran over 9600 bit / sec modems and it WAS important.

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so, now it is completely useless ? – Patrick Sep 24 '10 at 16:21
    
@Patrick: That depends on a lot of things. A large image downloaded over a slow wireless connection might benefit. And don't forget there still road-warriors out there using modems of the telephone line variety. Personally I think the progressive download has little benefit. I usually tune my website design to a minimum of at least DSL and just accept that some folks will find the site non-friendly if not downright unusable unless they turn images off. It might be different if I was trying to meet federal or company requirements but for my personal site I don't bother. – hotei Sep 24 '10 at 16:56
    
It's not completely useless, but it's less important now. It allows people on slow connections to get a vague picture at the start that slowly increases in quality versus showing up line by line. – Aren B Sep 24 '10 at 17:08

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