[iOS] High battery usage on M1 iPad Pro

I noticed today that when I was playing back a video (h.264, 480p24, hardware encoding setting is enabled, the video source was the Files app), VLC had got my battery down from around 30% to 10% while playing a ~25-minute video (half of the time it was paused, in total VLC was in the foreground for 55 minutes according to Battery statics in iOS).

I only recently got this iPad and my last device was the iPad Air 2, which had no problem like this.