Navigraph and CPU

Hello.
I’m using the i5 13th gen CPU and a 4070 GPU and 32 GB DDR5 RAM in a set up that’s 2 weeks old. When I’m flight planning in MSFS using your wonderful resources, I receive a message via Norton that Navigraph is putting excessive strain on my CPU! (or word to that effect) I’ve never had this before even on my older and far more inferior set up.

Any idea please as to what migh be causing this?
Thanks
Raif

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