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/)