How does Google determine page speed ?

Google Fred Unpublished from Google 

Since the beginning of the eighth of March, a new update called Google Fred has been launched unannounced by Google. The impact of Google's unique update has been very strong. Since the beginning of March 10, 2017, the results of the search have varied by 90%. Most of the websites have been hacked. Search engine results are also sudden without warning Great sites have fallen so famous and so far There is no comment about the Google update Fred - Google Fred is officially made by Google employees.

Opinions of web site owners

Some webmasters have spoken, some said that Google's new Fareed update targets low-profit and profit-only websites, but if we think a little bit about how a site can rank first in the search engine and its content is low and low-end? This is an entirely unconvincing analysis and conclusion.
Some have talked about the owners of sites and expertise in the management of sites and SEO, and some of them concluded that the new Google Update targeted sites that publish links all over the place is annoying and large and abnormal and abnormal.

Did not come out of a statement from Google did not issue an official statement about this new update called Google Fred

In the end, all these analyzes and conclusions from some people and managers of websites and specialists to improve sites in the search engines so far did not come out of a statement from Google has not issued a formal statement about this new update called Google Fred, which hit many sites and removed from the first results in the engine search

A question was addressed to Mr. Gary Illyeshp

A Google employee about the new Google Fred update, which caused a lot of talk and talk about it and increased analysis and conclusions and opinions on the quality of the update and the main objective of the response, where he said Gad Gedi shocked everyone said that they will not discuss this update publicly and added that the affected sites are sites that violate the guidelines Quality for Google Search Engine.