is there any difference between the debug level (warn, info, debug..) when the application is packaged to be released on the appstore ? i mean, is there any incidence on application speed, memory etc.. ?
I've wondered that myself. But, I haven't found any difference with them in or out when running on an actual device. At least on Android, the system is constantly logging information. You can view those log messages if you connect your phone and use the ADB tool. I haven't tried, but I'm pretty sure you can with XCode and an iOS device, too.
My app is in the store (both) and it didn't affect Apple's approval. YMMV.
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