Optimisation resetting to 'LOW' on VM Start

Hi guys
I have a new M1 Max and Parallels Pro which I'm trying to use to run VS 2022 for Blazor on Windows 11. The basic problem is it takes 2 minutes to build a basic Blazor app which takes about 20 seconds on pretty standard Azure VM. See the attached: I set the Parallels Optimization Slider to medium (or anything) and after Windows has started it's set back to LOW.
Has anyone got any ideas on what settings I'm missing?
Thanks
Rod