Lower device power train.
I started off with over 75% battery on a virtual ride in TrainingPeaks and it went down to 10% in less than an hour. My iPad has never drained that fast on Zwift, Rouvy, or FulGaz.
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Many thanks for your suggestion and support for TrainingPeaks Virtual.
I'm delighted to say that this is already fully implemented. Simply go to the Main Menu > Options > Graphics Settings and you can adjust the various settings there to reduce the battery drain.