I’m using Plexamp on an iPad mini and I noticed, without being able to demonstrate, that the battery drain is much faster since last update to 3.3.1 while being in the same operating conditions than with the previous versions.
Plexamp is the only app I’m running, streaming over Airplay, screen always on.
streaming over airplay with the screen on is going to represent higher battery drain especially if you have a visualizer on. nothing else in the area has changed that i know of.