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Re:Google Page Speed Online by ohashi on Wednesday October 12, 2011 @04:30PM (#3104433)
Perhaps they are caching their results?

You could try modifying the URL a bit to try and trick in into thinking it's new (add a '?' or '/', pass some useless variables)

Re:Google Page Speed Online by lux on Thursday October 13, 2011 @10:34AM (#3107263)
Seems to be caching individual file info for JS, CSS, and images, regardless of the page URL...