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hey bro I did not know but I did a google search & came up with this it was from xda developers
"Update 9/28: Now contains the SDK 1.6 zipalign binary and routine to align each APK after optimization. This results in slightly larger file sizes but a smaller RAM footprint and faster performance. For more information about zipalign"
From what I am reading & believe I am understanding is that it is making them a smaller size such as moving a app to sd card I know you cant do that with live wallpapers it makes it lag hope this help bro