This section describes the performance impact of some basic portal site operations.
Single Sign-On Operations
SharePoint Portal Server has built-in single sign-on (SSO)
support for writing solutions that access different back-end
systems. These solutions store credentials that can be retrieved
programmatically later. On a medium farm, the portal site can
retrieve approximately 100 credentials per second and store
approximately 90 credentials per second using the SSO
interfaces.
Web Services
For planning purposes, consider Web service requests equivalent
to page requests.