Of course it does!
“There is an inverse relationship between your website’s loading speed and ROI. The longer it takes for a web-page to load, the lower your ROI and vice-versa. And there is a very reasonable explanation for this…slow loading pages lead to bad user experience, bad user experience causes missed leads, missed leads cause high bounce rate and high bounce rate causes poor SERPs.”
- As picked from Keyword Country’s blog (http://www.keywordcountry.com/blog/google-optimization/matt-cutts-reveals-4-killer-seo-tips-to-his-kidnappers/)