Adobe Fireworks uses the PNG file format as its native format, storing metadata in â€œprivate chunksâ€ of the file that arenâ€™t used to render it. Unfortunately, if you publish your unoptimized images, the browser still has to download all of that metadata. In the above case, the server sent down a 10×30 pixel asset with just 164 bytes of image data (the IDAT chunk) and over 46kb of Adobe Fireworks private data. Fiddlerâ€™s ImageView Inspector will show you when your PNG file contains unneeded data, and if youâ€™d like to explore further, check out this great free PNG chunk decoder: http://entropymine.com/jason/tweakpng/ Lesson learned? If you donâ€™t need it, optimize your images and strip unnecessary meta-data from your image …
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