Live wallpapers on recent Android phones with similar processing power as the iPhone 4 don't lag or tax the phone in my experience. For one though, battery life with live wallpapers is good, almost as good as a static wallpaper.
I didn't notice any difference in a normal day when I had live wallpapers or a static one. When it is included in iOS, I bet most people who dog on it now will use it occasionally, and everyone else will welcome the option to choose. Developers will probably love it.
They greatly impact the battery. Check the "battery usage" on your Android phone. My love wallpaper (when I used it) was often responsible for 10% of my battery.
They greatly impact the battery. Check the "battery usage" on your Android phone. My love wallpaper (when I used it) was often responsible for 10% of my battery.