New document on performance published on Technet; gives good guidance and recommendations for use of Forms Server and dataconnections.

In this article:

• Key characteristics

• Test environment

• Test results

• Recommendations

This performance and capacity planning scenario incorporates a single Microsoft Office SharePoint Server 2007 farm that is running InfoPath Forms Services. The farm is used to publish InfoPath form templates. Note that the test results that are shown in this article are specific to InfoPath Forms Services in Office SharePoint Server 2007. Test results may not be representative of the performance characteristics of Microsoft Office Forms Server 2007.

Note the link to InfoPath Forms Services 2007 Web testing toolkit at the very bottom. The toolkit has been around for a while but has not really been known to a wide audience.