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Slow App Startup Times

Apple suggest to aim for a total app launch time of under 400ms and you must do it in less than 20 seconds or the system will kill your app. You control what your application delegate does but how do you debug slow startup times that happen before your code is even called? Here is a tip from WWDC 2016 that might help: To try it out add the environment variable DYLD_PRINT_STATISTICS to your project scheme with a value of 1.

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