European SEO Factory | http://www.gamesload.it/
I deduced that from an earlier post which you first submitted in Italian; and, then, after correcting the spelling of the first word in that post, translated into English using Google. Unfortunately, Google does little more than a literal translation, so that the result frequently does not precisely convey the intended meaning.
Presumably you refer to what Google Webmaster Tools(WMT) reports under "Site Performance."
This is not data collected by Google by way of directly scanning your site, but rather indirectly from Google users whose browsers support a specific protocol, the majority of which do not yet do so. Thus, such data sets are frequently quite small, unreliable, and updated only infrequently, as noted appropriately on WMT. Accordingly, Google gives very little weight to load times, except for AdWords listings, where Google does directly measure the load time of an ad's landing page.
I myself have observed that what is here reported by WMT is rather volatile, as is to be expected given the very small sample size of users, and can even differ significantly depending on which canonical form - WWW.DomainName.TLD vsDomainName.TLD - is being viewed in WMT.
This raises the question as to how much of Google's on-line documentation, blog content and tools has been professionally translated from English into other languages.
Those who are forced to rely on Google's translation tool are at a great disadvantage.