Open Radar

 
Summary:
Beginning in iOS 7, canOpenURL: takes 10-20x as long to execute than in all previous iOS versions.  Interestingly, it appears to only slow down on devices with a SIM.  This is detrimental to my app (Launch Center Pro) which provides the user with URL scheme actions usable on their system.  Scanning our list of ~1700 known URL schemes previously took ~1-2 seconds on an iPhone 5.  It now takes ~20+ seconds.  On an iPad or iPod Touch, it remains fast.

Steps to Reproduce:
1) Launch Xcode 5

2) Set up some basic time logging or watch instruments

3) Make call(s) to canOpenURL like so:
[[UIApplication sharedApplication] canOpenURL:url];

4) Observe time variation on different devices, include those with and without a SIM.

Expected Results:
We expect performance on par with previous iOS versions, or iOS 7 on devices without a SIM.

Actual Results:
On devices with a SIM, the processing time is 10-20x longer than those without, or on all devices in iOS 6.x and earlier.

Additionally, memory allocations within the related private framework seem to grow on problem-devices.

Version:
iOS 7.0 GM (And previous betas)

Notes:
The attached test project iterates through a large sample array of URL schemes.  Total elapsed time is measured.  In my testing, when run on an iPad Mini with iOS 7 GM, it completes in ~2 seconds.  Running on an iPhone 5 with iOS 7 GM, it completes in ~22 seconds.  (And almost instantly (0.2 seconds) in the Simulator.)

Configuration:
Through our testing and testing of others, the problem appears on devices running iOS 7.0 (all betas and GM) which also have a SIM installed.  

Some users report that removing the SIM and resetting all settings (in Settings.app) causes the problem to go away.  Re-inserting the SIM causes the problem to return.  (I've not independently confirmed this.)

Attachments:
'CanOpenUrlTest.zip' was successfully uploaded.