I also had this problem, got a crash at about 1600 MKPolylines. Then I reduced them to < 10, each having lot more points and for now seems OK. (The Metal assertion still shows, the memory grows to 1G but then reduces itself to the normal state about 200M).
emovla
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I had the same problem. The app crashed at about 1600 MKPolylines, then I was able to reduce them to <10 (each with lot more points) and for now seems OK. (The Metal assertion still fails and the memory usage grows to 1G but then reduces itself to the normal 200M.)