Distributing stored data across different geographical regions is not uncommon. Due to regional laws you might even be forced to store your application data in a certain geographical region. Windows Azure PaaS therefore offers storage services, i.e. BLOB, Table or Queue distributed across their data centers. Distributing data however raises the question if you also need to distribute your application that accesses this data in order to not run into any performance problems. One of our partners contemplated about that idea. In order to get some answers we ran a test to analyze the performance impact of different data distribution scenarios. Let me share our results in this blog:

http://blog.dynatrace.com/2012/07/04/how-to-monitor-and-analyze-performance-of-the-windows-azure-storage-service/