I love the app but it seems to be very inefficient with caching of data, especially pics. I've been surfing c/pics for a few time and very quickly got the mobile data usage alarm, was almost 2Gb. It seems the app is loading all full pictures of the whole community. Not sure how other apps are doing or how it was done by reddit apps but I'd assume the only preload a lower resolution version of the thumbnails of the pics.

Also it seems lemmyconnect is not properly caching the thumbnails. So if I click on a post in the overview to seen the comment, then go back to the overview, all the pic thumbnails have to be reloaded. You can easily see this when you try surfing in low bandwidth situations.