Redrawing pages only when file has changed

[guest]

When loading a file in GSView, heavy graphics are loaded slowly but this can be done in background because GSView will not redraw the page unless the file has changed. This cannot be done with Lucide. When Lucide loads the same page and is put in the background, it will load it again when going back to the front. You have to wait until the page is completely drawn without doing something else. This is very annoying when a file contains lots of heavy graphics.