Mobile Friendly Sites are Ranked Very Fast!
Google introduced a new feature that is mobile friendly test tool. Check your website pages with the following tool https://www.google.com/webmasters/tools/mobile-friendly/
If your site is mobile friendly it will be displayed status “Awesome this page is mobile friendly” if not the status will display “not mobile friendly”.
If your site is not mobile friendly you can update new version WordPress 4.1.1 Before going to update new version make sure backup. After updating new version WordPress you can clear your browser history and try again checking your site in the mobile friendly testing tool. The following tool provides suggestion to fix errors to improve your website speed on mobile devices. Google has confirmed mobile friendly is ranking factor it will be work from April 21st 2015.