Impact on CPU when using Standard or Performance L4 type virtual servers

Perform layer 4 is faster than standard most of the time. In theory, they have similar functionality but perform layer 4 uses fast layer 4 profile. If you are using a platform with PVA (or the new variants of PVA), the traffic will be processed by the PVA. Without PVA the traffic is processed by TMM (F5 kernel), and that uses the CPU. With PVA, that is processed within the PVA, so less work for the CPU.

More information here:

https://support.f5.com/csp/article/K8082l4

https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/ltm-basics-13-0-0/2.html