Massive IOS lag in-game suddenly won't go away (6s Plus)

So I’ve been playing Siralim 2 for a while now.
All of a sudden I experience massive lag in the game that persists even after closing the game and removing every task from the multitask. No idea what I need to do to remove it.

I begun noticing it after I left the app stationary in multitask while in a realm for a while without doing anything. When I came back to the game the lag was there all of a sudden and hasn’t left since. Realm 30.

The lag is only while walking around and battling WITHIN a realm and greatly varies in intensity.