The Preloaded windows function allows to increase the applicationresponsiveness when new windows are displayed for the first time (from the application runtime start).
The preload of the selected windows starts after the Home windows are displayed (see Application properties).
It is performed as a background process and the user can use/change the active windows (even if the new window is not yet preloaded: it will be loaded normally).
The progress of the preload process can be monitored with the system tags$WindowPreloadProgress (an integer percentage of the windows already preloaded).