Whitepaper on Workflow Performance Characteristics

Via Paul, this new paper on MSDN lays out some interesting tests to provide developers with information about some of the design impacts when using WF.  These are always fun to read and then later to watch people hold them up as gospel about why they made really weird design choices. :)  Please, take these for what they are: guidelines and information.  Don't decide that you'll never use a while activity because it is slower than some other activities.  Test on your own system and add some complexity with custom activities if you really need the performance.