Simply add the wallpapers to a "rotation list" in the app and then you can rotate through your list with a single click on the widget. Additionally, you can also activate a timer which automatically changes your background image on a predefined time interval. You can also chose to enable the timer only when connected to an external power supply, though I haven't felt a significant battery drain with an interval of 30 mins yet.
If you don't use the timer, then there's no background service running or something, so it shouldn't affect your battery or performence in any way. Therefore it might take some seconds to actually change the wallpaper as the images are loaded only on demand.
Android-Market | AppBrain
Feel free to post any kind of feedback / suggestions / bug-reports here
Current beta version: http://forum.xda-developers.com/show...&postcount=126
Wallpaper Changer, App for the Apps & Games
Last Updated 2014-11-06