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pagespeed insights 指出的图片压缩对比，是基于什么算法？

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pagespeed insights 指出的图片压缩对比，是基于什么算法？

pagespeed insights 测试自己的网站，网页的图片已经压缩过了，但是谷歌提醒还可以节省大概 50%体积。

个人感觉Google的压缩算法有点狠，我已经无损然后有损压缩了，还是达不到Google的标准，请问Google的压缩算法是怎样的，有公开资料么？


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应该跟这个是类似的，这个是nginx模块的源码

https://github.com/pagespeed/...


与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
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