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Well, in general for real-time communication and independent on the real-time protocol, HW support always helps in getting more performance and dealing with higher quantity frameworks (high amount of devices on the network, high data volumes, bandwidth of non-realtime traffic in addition to real-time traffic etc.).
In case of Profinet IRT, special HW support is typically needed to realize isochronous real-time with jitter of 1µs.
Profinet RT also works with "COTS" hardware. The needed performance, accuracy on realtime quality and quantity structures should be taken into consideration if special HW should be used or not. In addition it is also a question of how much processing load you want to give to the given CPU host system or not.