For a while now (september 2015)  Apple requires apps that are submitted to iTunes to be 64 bit. When building your app for the simulator this isn’t required because app doesn’t go through the Apple screening. Since iOS 10.1 update however Apple added a little popup that checks if an app supports X64 and otherwise will show you a popup telling: “[App name] may slow down your iPhone”. It will only show the error message once and is meant for old apps which are added to the store before september 2015 and are still on peoples phones/tablets who need to update to X64.

Popup message: [App name] may slow down your iPhone

Screen Shot 2016-11-08 at 22.09.46

The fix is quite easy. just set the iOS build to support X64 also when building for the simulator.

Xamarin Studio

in Xamarin Studio go to properties of your iOS project. by rightclicking your iOS project. -> iOS Build tab  -> make sure that Supported Architecture for each configuration contains X86_64 or i386 + x86_64

Screen Shot 2016-11-08 at 22.08.58

Visual Studio

in Visual Studio right click your iOS project and select properties. -> go to iOS Build -> Advance tab ->make sure that Supported Architecture for each configuration contains X86_64 or i386 + x86_64

Screen Shot 2016-11-08 at 21.45.38

 

Although this is a small issue i got some questions by new developers what this message meant. so hopefully this blogposts helps those who were questioning why this message is showing up all of a sudden.

Happy coding!

Geert van der Cruijsen

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