@Zeanuck - To be honest I’ve just learnt to live with it! There are very few votes on this thread so I guess most people don’t know about the issue or don’t care. However, I know the CPU spiking is real and not system/settings dependent as I’ve recently completely rebuild my gaming PC (now 7800X3D/RTX 4090/fresh Windows 11/Fresh MSFS) and still experience the CPU spikes 
(I should say that I notice them a lot less with the 7800X3D)
Edit: Ah I’ve just re-read your post with the screen shot. I think your issue is different to the one created this thread for. You are getting periodic CPU spikes. I described in my OP that these spikes I’m seeing are geographically based and not periodic. In other words if I’m parked at an airport I won’t see any spikes but if I move then at a certain (seemingly random) geographic location I’ll see a spike. This is repeatable.