Slow internet and also slow devices! If you're targeting the general population (so, chat service, banking app, utility app,...), you should be targeting the m

Slow internet and also slow devices! If you're targeting the general population (so, chat service, banking app, utility app,...), you should be targeting the majority of users, not just the new-flagship ones, so all the testing should be done on a cheapest smartphone you could buy in a supermarket two years ago (because well.. that's what "grandmas" use). Then downgrade the connection to 3g, or maybe even edge speeds (can be smulated on network devices), and the app/service should still work. Somehow it seems that devs get the best new flagships only, optimize the software for that, and forget about the rest... and I understand that for a 3d shooter game or something, but an eg. banking app, should work on older devices too!