MacOS generally uses mouse cursors we specifically made for that platform. But in some cases, like WM_CURSOR_WAIT, the OS does not have an equivalent and we don't have a platform-specific one. So it then uses of of our base custom cursors. This type of cursor is always enlarged on Mac high-DPI displays like Retina. So no need to ever supply larger versions of this type of cursor as it will just get huge. Pull Request: https://projects.blender.org/blender/blender/pulls/136005