The ''Preloaded windows'' function allows to increase the [JSup application|application] [http://en.wikipedia.org/wiki/Responsiveness|responsiveness] when new [JSup graphic windows|windows] are displayed for the first time (from the application runtime start).

To select which [JSup graphic windows|windows] will be preloaded on [JSup application|application] startup open the [JSup Application properties|Application properties] dialog and click on the ''Preloaded wins'' button.

The preload of the selected windows starts after the ''Home windows'' are displayed (see [JSup Application properties#Main tab|Application properties]). 
It is performed as a [http://en.wikipedia.org/wiki/Background_%28computer_software%29|background process] and the user can use/change the active [JSup graphic windows|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 [JSup System tags|system tags] <TT>$WindowPreloadProgress</TT> (an integer percentage of the windows already preloaded).

The ''window preload'' feature is active only when the [JSup application|application] starts directly in runtime (and not by [JSup Switch application to runtime and edit mode|switching from edit mode to runtime]).

Note that [JSup graphic windows#Window type|'''modal windows'''] have to be reloaded each time they are displayed, so it is useless to include them in the ''preloaded windows''.

You can bypass the ''Preloaded windows'' selection with two properties of [JSup.cfg] file:
 * <TT>jsup.window.preload.disabled</TT>: if set to "''1''" then no preload will be done at all.
 * <TT>jsup.window.preload.all</TT>: if set to "''1''" then all non [JSup Library windows|library] and non [JSup disabled windows|disabled windows] will be preloaded even if not selected in the [JSup Application properties|Application properties].

Use the ''Preloaded windows'' function to improve the end-user [JSup] experience.