As of Sept 2017, the names have changed and become easier. https://support.office.com/en-us/article/changes-to-slow-fast-level-names-for-office-insider-for-windows-desktop-055ee4f9-9ce3-4fb8-8a9a-ca6745867d52
As of Sept 2017, the names have changed and become easier.
https://support.office.com/en-us/article/changes-to-slow-fast-level-names-for-office-insider-for-windows-desktop-055ee4f9-9ce3-4fb8-8a9a-ca6745867d52