Options on this tab determine some key behaviors of Picasa slide shows (whether generated with the View > Slideshow or View > Timeline command).
Loop slideshow. Slide shows normally display each image in the selected folder or label only once. Check this option to make a show loop repeatedly through the pictures until it's manually halted.
Do full-resolution slideshow. Check this option for higher quality slide shows. Remove the check mark if you have an older or less capable computer.