I Pad pro 2020 battery problem with lightroom

Hey there

I have a huge problem with the IPad pro 2020 (Battery problem).

I tried surtend things out for example I used my I Pad in different Applications and counted the time and how much battery I've lost. Every application needs for 20 mins 3%= 10hours

But lightroom needed a lot more battery. I didn't have any problems with the Ipad Pro 2018 but with the 2020 version. Lightroom is the problem why I lose so much battery. 

Can someone helps me? I nearly sended my IPad back to Apple but now I know the problem but don't how to fix it!

thank you already!