I've been testing Amethyst randomly for months now and unfortunately 98% of the time it is unusable for me. My device has a Snapdragon 712 paired with 8gb of ram, not the latest and greatest but should be more than sufficient. Clearing cache does not help. My client of choice on Android is Nostros but it hasn't been updated for a while now, the dev is dealing with some life stuff. Plasma is another client I keep an eye on but it's still missing a few features I need, like editing relays & zaps.