Hi there
Thanks for getting in touch!
You could get a slight speed increase by putting your maps in some kind of control that stops the map from being displayed.
There will still be a performance hit as they load, but not loading image data or rendering will speed things up considerably depending on how many maps you have.
There is no solution to delay loading without editing the core files, which isn’t recommended as you’d lose your changes when updating.
Could you try the above suggestion if that sounds acceptable to you?
Kind regards
– Perry