What exactly does FastL4 profile do?

Also someone clarify the last couple paragraphs in this doc;

 

 

https://support.f5.com/kb/en-us/solutions/public/4000/800/sol4832.html

 

 

 

"The In Packet Path column in the PDF files represents values that are displayed based on how the PVA Acceleration status is affected by a feature that is not based directly on the configuration of the virtual server, such as a SNAT or a packet filter.

 

 

For example, the existence of a SNAT does not demote a virtual server's displayed acceleration status to Assisted because there may not be any traffic that matches the SNAT's source address. In this case, the In Virtual Server UI column for SNAT is Full. However, traffic traversing the virtual server that does match the SNAT's source address, is demoted to Assisted. This is represented by the In Packet Path column in the PDF files."

 

 

So let say I'm using SNAT auto map on a VS with the default FastL4 profile enabled, is it operating in assisted mode? would iRules work? Or would I have to manually put it in assisted mode for irules to function...

 

 

Thanks!