Is there any way to shortcut some of the Spinup of my Silverlight App

   What you need is a way to do application warm up prior to the first user request.  WCF services in IIS use message-based activation, which means they don't start until explicitly requested.  For DevForce this means that the BOS (the EntityService and any EntityServers) don't start until needed.  If you're using IIS 7.5 there's actually a warm up module available; if you're running an earlier version you'll need a do-it-yourself approach.  This can be as simple as a scheduled script which navigates to the services, e.g., http://myhost/mysite/EntityService.svc and http://myhost/mysite/EntityServer.svc.  Navigating to both these URLs will start the BOS, and will reduce some of that spin up time you're seeing.

Your log also shows that most of the delay is in the first fetch.  If you're not already using them, pre-generated views for the entity model can have a huge performance impact.   See http://msdn.microsoft.com/en-us/library/bb896240.aspx for more information.  If you don't want to use the pre-generated views, then doing some sort of dummy query, and dummy save, in a warm up script will effectively do the same thing.

A few other things to look at - make sure you're not doing a debug compilation (the  <compilation debug=�true�/> switch in the web.config) or even look at pre-compiling the web site using aspnet_compiler.