I think we got hung up on the issue of performance issues since upgrading (both SR and their hardware.) I think both are off the table.

The question at hand is purely a matter of them needing to optimize their performance as much as possible. To that end, understanding the key elements of hardware's impact on the SOAP server would help them make better choices in what to purchase, how to configure, and how to test. In other words, if you were to build the optimal machine for performance, what are the factors you'd be most concerned with?

Any Windows OS configurations you'd want to implement other than possibly ensuring no antivirus was running and running in performance instead of balanced or power saving modes?