Need a Benchmark documents for F5 Advanced WAF or Big-IP or etc.

Its less about the WAF - and more about what appliance you have deployed and how much resources it has- and how you plan on using it. 

There are those that are using small appiances like a i2600 with AWAF, others with a i15000 and others that are using 8slot viprions.     These can be clustered to provide even more thruput as needed.

Other factors include:    Are you in transparent mode or blocking mode?   are you using traditional syslog or HSL?   What is your network configuration GB, 10GB, teamed?  Is your appliance on a stick?  What components of AWAF are you deploying - IPI?  BOT? ddos, layer4 detections - layer7 detections,  Signatures only, threat campains, geoblocking,    Datagard etc.   What kind of cert are you using 2k - 4k other?  What kind of normal user load are you expecting 1000pps, 10,000pps?   Will the f5 be on the edge - will there be a firewall in front?  will there be any layer3/4 mitigations.

FWIW - I deployed WAF before i deployied IPI.   Lesson learned:   
WAF did its job -and the appliances were very busy inspecting packets and doing waf like things....
Once i deployed IPI ,  the appiance dropped over 70% of traffic BEFORE waf inspection.   This resulted in much less resources consumed, and provided the needed  CPU to process more WAF requests.

Any vendor that provides a "configuration bench mark"  - without defineing the hardware used -and the configuration deployed is providing bad data.  The real information that is needed is what is YOUR baseline before - and what are you deploying hardware and configuration --then what is the baseline AFTER.