On my website www.ecocitycraft.com I have an issue when using firefox and the following settings: http://i.imgur.com/fy23LLn.png Basically with smooth scrolling, scrolling down the page is nice and lag free, however scrolling back up is very choppy and laggy. I cannot reproduce this on any other website but my own. As well using internet explorer / chrome doesn't cause this issue for me. Just firefox. Any help?