Hi All
These are all very useful and interesting comments. Taking all your advice, I’m now getting what I’d consider decent performance anywhere in the UK but not EGLC / London, but I guess that scenery just chews up CPU/GPU - still paying around and tweaking stuff.
On a side note, I tried the same thing in XPlane and it was smooth all the way, although I am using Orbx for London, the buildings are just not as good for the none iconic buildings.
I did wonder if (and probably not the case now) that the use of OpenXR may be an issue with the CV1 if that platform have more direct support for the mixed reality bunch of headsets.
Thanks again for all your comments and suggestions.