title: WCF Data Services: Call to SaveChanges() causes 100% CPU
body: <p>I am developing a WCF Data Service over an Entity Framework 4.0 data model, but there's no way we can go to Production under the current circumstances.</p>
  
  <p>My client application is adding and modifying a lot of objects, around 100,000. Then it calls the service's SaveChanges method to persist all changes in a single action. The WCF Data Service is hosted in an NServiceBus host process, although I don't know if that contributes to the issue.</p>
  
  <p>This works, but it takes more than an hour on a 1-CPU, 4GB RAM, Win2008 x64 virtual machine. More importantly, CPU utilization goes up to 100%. RAM consumption fluctuates between 75% and 85%. This is in a development environment virtual machine, so the SQL Server 2005 database the service is covering is local. The WCF Data Service's host process eats up around 1.2 GB during this process.</p>
  
  <p>Any ideas?? Many thanks in advance!</p>