In an Enterprise Architecture we can setup Dynamics CRM in application and platform server. You could enhance performance by setting up a NLB for the application server, so you can use more than one application server. Of course this will also enhance your availibity of the application/
There was lot of discussion about what to do with platform server. Can we replicate it too, do we have to use cold fail over etc. The solutions is even nicer, a Microsoft Consultant pointed me to this whitepaper "Performance and Scalability Assessment of Customer Implementation"
The article describes a test where the platform server was deployed in NLB setup.
Check it out!