i am using ios 12. Although it works on iphone 6 (no longer updates to ios 13 including iphone 5s). The iphone 6 is slightly faster than iphone 5s even though they have the same ram. So its most likely a code issue
Yes but your forgot processing power, It needs a better mobile cpu.
That is not how things work.
yes it is, I am a game dev don't argue with me. they need ram And a decent cpu
