Does Google socre site for their performance

[moneypro]

Hi,
I am writing a blog post for my blog.
I want to know whether Google scores sites for their performance. I have heard that it is good to add Google analytics to analysis website. Google can directly know which website is better by analyzing bounce rate, conversion rate and many other factors. Google also track RSS feed stats, social metrics.
So I want information with reference really Google track site's performance.

[Clarkjackson]

Yes, Google score the sites as per their performance. Means;

How quick their pages load
bounce rate
Visitors time on the site
content sharing
etc

[moneypro]

Yes, Google score the sites as per their performance. Means;

How quick their pages load
bounce rate
Visitors time on the site
content sharing
etc

Ya. I understand. But can you provide any reference or blog post on this topic or official announcement. I have searched lot but couldn't find.