Ipad 1 has 256 mb of ram. ipad 2 has double that. and ipad 3 and 4 have double that of ipad 2. later oss, and the apps that take advantage of later oss and newer hardware (in newer ipads), will increasingly tax older ipads.. When ipad mini has been restarted, all the ram gets written again, that’s why it may fix ipad mini crashing. 2 hard reset your ipad mini press and hold the power button and home button at the same time for at least 10-12 seconds until the apple logo appears.. €
