these are only information about stateless virtual i found.
UDP performance
This release provides UDP performance improvements through use of the Stateless virtual server type.
Release Note: BIG-IP LTM and TMOS version 10.2.3
http://support.f5.com/kb/en-us/products/big-ip_ltm/releasenotes/product/relnotes-LTM-10-2-3.html
Stateless
A Stateless virtual server improves the performance of UDP traffic in specific scenarios. (v. 10.2.2 and later)
sol12272: Overview of virtual server types for BIG-IP version 10.x
http://support.f5.com/kb/en-us/solutions/public/12000/200/sol12272.html