Whenever I upload a video to Youtube that I've created in WMM 2012, it takes a long time and gives me this message: "Your videos will process faster if you encode into a streamable format.  For more information, visit our Help Center."  Naturally, the help centre gave me no insight as to what I could do differently with WMM.  I have since saved my videos using the option specifically for YouTube, but it doesn't change anything.  It used to be, with my previous version of WMM, that Youtube uploads were reasonably quick with no message like this.