INat consumes a lot of energy on my iPhone

[upupa-epops]

I don’t know if it’s still the case but there used to be an issue where if you used the app for a long time (months/years) it would slowly start taking up a lot of space and slow down the phone in general. As far as I know that’s been fixed, but it’s possible you’re experiencing something similar? In which case you could try logging out and back in, or uninstalling and reinstalling the app, and see if that helps, if you haven’t tried that yet.