CPU consumption trend and GRE Tunnel

[Map23]

Hi all, 

I have a Cisco  WS-C3850-48T and I did a simple configuration with Tunnel and OSPF.

With this configuration I noted that CPU consumption is strict related to traffic that pass through GRE. 

I read many posts and seems that is it a normal behavior, so is possibile improve CPU performance with this type of traffic ? 

I mean, fast switching or other feature that can help. 

Attached there are graphs that shown relationship between traffic that pass on Tunnel an CPU.

Thank you, 

and merry Christmas

[Joseph W. Doherty]

If the tunnel end-point is on the device, minimizing fragmentation often mitigates CPU consumption, but on a switch if GRE is not supported in hardware, you'll likely fine the CPU is a limiting factor (which on a multigig switch isn't [the CPU] all that powerful since most traffic forwarding is done by dedicated hardware).