Why Xcode12.3 takes up more than 18GB of RAM?

This code fails to decode when running on iOS 18.0 or 18.1 beta device. But succeeds below iOS 18, such as iOS 17.5. Xcode Version 16.0 (16A242d) let base64String = "1ZwoNohdE8Nteis/IXl1rg==" if let decodedData = Data(base64Encoded: base64String, options: .ignoreUnknownCharacters) { if let decodedString = String(data: decodedData, encoding: .ascii) { print("Decoded string: \(decodedString)") } else { print("Failed to decode string using ascii encoding") } } else { print("Failed to decode Base64 string") }