Google have stated that speed is a ranking factor:https://www.mattcutts.com/blog/site-speed/Does implementing SPDY have any consequence for SEO?
Does SPDY benefit SEO rankings?
seo;page speed;spdy
The Googlebot is not currently SPDY enabled as of 2014-12-30.Although Googlebot will not be detecting faster load times as a result of SPDY, there may be an indirect benefit from improved user experience from faster load times.Faster load times may result in better user experience which can increase engagement on your site. Google measures engagement in different ways.For example a very slow site will have a lot of users pogo sticking (http://moz.com/blog/solving-the-pogo-stick-problem-whiteboard-friday) back to the SERP results  which will have a negative effect on ranking.