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have you installed the languagepack en-GB for all users? microsoft guideline is quite good: https://docs.microsoft.com/en-us/azure/virtual-desktop/language-packs#create-a-custom-windows-10-enterprise-multi-session-image-automatically

yes, we are British! but 6 seconds added to the desktop launch due to AppX processing of that language pack on every logon? ControlUP is complaining that we an unacceptable Desktop load time.