Hi @pbh4,
Check this doc out! : Image Optimization | Adalo Resources You could implement image compression by configuring another API you’re aware of, too.
Do you meant storing the data on user’s device, like local storage? That’s not something possible, unfortunately. (correct me if I’m wrong) Vote here : Local Device Storage | Voters | Adalo
You can use Xano as the main database with the easy Xano integration but what’s the solution you have in mind for pictures?
You can start from Adalo dB and then migrate to like Xano dB or any other dB (see this video made by Nathan. : https://youtu.be/-k46gRS1uBw) if needed but with Adalo’s most recent updates, using Adalo dB is quite good. See this post created by Shantanu. : How much traffic can Adalo handle - #2 by ishantanusrivastava I’m working with a maker where the app have quite few collections with much data (3 main collections: 13.9k records, 10.8k records, 21.9k records) and yes, there’s quite performance wise issues but overall the app is working still :). @nadavma2, might have some experiences to share here too 
Thank you and have a great day!