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????1????????????????????????????????????????????????δ??????
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????1???? PageSpeed Insignts??
????PageSpeed?????????????????????????????????????????????????????google??”Make the web faster”????￡??????”????”??”???”???????????????????? PageSpeed Insights??PageSpeed Insights????
????a??PageSpeed Insights???????????????????????URL???????PageSpeed???????????????google??????????????????????
????b??PageSpeed Insights API??????????google???????????google??PageSpeed Insights API????????????????????API Server??????????????????????????????????????????????????????
????c??PageSpeed??????????browser extensions?????chrome??firefox???????????????????????http://code.google.com/p/page-speed/????????????????????????????????????????????????hosts????fiddler??????PageSpeed????????????????????????????????????????????????????????????????C++???????????????????tommy?????????δ??????????????????????2????henry??
????2??????HTTP Archive?
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????httparchive???Steve souders?????????????????????????????????????????httparchive????????????????http://httparchive.org/downloads.php????
????????????????????????????httparchive???????????Щ????????????????в??????
????????No?????Steve souders????httparchive?????????httparchive???????????????????????????????????????????????????????????URL??httparchive???????????httparchive??????з???????????????????а????????????Steve Souders????????????????????????????” It’s built on the shoulders of Pat Meenan’s  WebPagetest system.”HTTP Archive?????WebPageTest???????
????3??????WebPageTest?
????WebPageTest??http://www.webpagetest.org/????google ??????”make the web faster “???????(“make the web faster????page speed??spdy??tcpm???”)??????????AOL?????????????????2008?????BSD?????
????OK?????????????????????WebPageTest??????????????????????????????????????????????????顣
?????????????????google Test Driver?????????Server??????????Agent??????????????????:(https://sites.google.com/a/webpagetest.org/docs/system-design/overview)

????OK?????????????????????????https://sites.google.com/a/webpagetest.org ???????????????????????????????????