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Swiftで処理時間を計測

シンプルな(というかざっくりな)場合はこうです。

let start = Date()

//重い処理を書く

let elapsed = Date().timeIntervalSince(start)
print(elapsed)

ベンチマーク用のクラスがほしい方は下記が参考になります。
Swiftで重い処理の処理時間を測定する

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41
Help us understand the problem. What are the problem?