Fun but too damn laggy and crashes

Ive only started playing this game less than 2 days ago. Day 1, it was fun and had no problems with it. But then day 2 arrived, and all it does is crash crash crash. And NO, dont tell me that I need to update because while I may still be running iOS 7 atm, but if it is this incompatible with 7 then why did it run smoothly with my device on the first day instead of just crashing?

Im only gonna give 2 stars until you guys fix it.

Albie412 about Dragon vs. Gods: Clan Wars, v6.6.0