It's actually the amount of them that is worrying. I have tested this myself. Once I delete my app and reinstall it's fine but sit there and afk for 10 hrs and you'll have a lot of customs getting put onto your device. The app doesn't put customs on the device until that custom is on your screen (or something similar to that). But this is nothing but a theory of my own. This is not the cause of server lag and most of us should know what it is. But the constant freezing in general could be caused by: Downloading customs as they appear on-screen or just having a massive amount.