Significant CPU usage spikes in low stress areas - caused by 'Rdr Thread'?

Excuse the HDR setting in the screenshot but I’m experiencing CPU usage spike in a similar manner. Nothing else seems to be taking over, its like the simulator just stops for a second. Otherwise the game is really smooth. I have even done a fresh install of windows and everything else and still have the issue and no setting changes make it better.
My PC should be good enough not to get massive stutter spikes like this. No other game experiences them. 5900x 4090 64gb ram.

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