Slow app launch time after updating to iOS 14 and Xcode 12

Question

I noticed that the launch time of my app has increased significantly (it takes a full minute now vs seconds before) since updating my device to iOS 14 and using Xcode 12. I tried several Xcode 12 betas and ran the app in the simulator with no issues, however the public releases seem to bring this issue.

I tested several of my apps and they all face this issue. Running the app again (without Xcode) is instant, even after restarting the device.

To be clear, I'm not talking about build time here, this is the time it takes the app to start after the splash screen shows up and Xcode's status is 'Running on iPhone'

Has anyone else experienced this issue or could it be something related to my machine?

Solution 1

I have the same problem, but solved this by doing the following things:

For simulators running iOS 14, delete folders inside ~/Library/Developer/Xcode/iOS DeviceSupport/ (folder's name started with "14").

For devices running iOS 14, select Xcode window tab, click Devices and Simulators, find your device, right-click to unpair the device

After doing the work, re-run your app, everything should be ok.

References:

• Apple forum post: Xcode 11 hangs while attaching debugger to ios process
• StackOverflow answer from: Can I delete data from the iOS DeviceSupport directory?

Solution 2

I also had this problem, here on Xcode Version 12.1 (12A7403).

The proposed solution to "Unpair" the device in Xcode "Devices and Simulators" didn't work for me (and lot's of people here). Xcode simply keeps crashing when trying that. Hard-reset of the device didn't solve it either.

What did the trick for me: Delete the iOS 14.1 folder inside ~/Library/Developer/Xcode/iOS DeviceSupport. Then simply reopen Xcode.

It takes a while for Xcode to "copy cache files" from the iPhone but once that's finally done, normal debug build and run behaviour is back, without the long delay.

Solution 3

Delete ~/Library/Developer/Xcode/iOS DeviceSupport/ and unpair/pair device doesn't work for me.

Click Edit Scheme of the project target, select Run phase row, and uncheck Debug executable below the Info tab, this solved my problem.

Solution 4

1. In the Xcode menu, Go to Product > Scheme > Edit Scheme
2. Open the Info tab
3. Uncheck the Debug executables checkbox

4. Close the Window.
5. Run the app and see the difference.

Solution 5

Having the same problem since yesterday...

I tried all the solutions here, without success.

What worked for me was to copy debugserver from Xcode 11.7 to Xcode 12.5 and i got back an (almost) immediate launch. Of course it's broke interactive debugger but helps to isolate the problem (LLDB)

After a lot of testing, downgrading macOS version to 11.2.3 fixes the launch problem (back to 3 seconds launch instead of 30+ seconds)

Downgrading is easy: In console, type:

softwareupdate --fetch-full-installer --full-installer-version 11.2.3

You will found the installer in /Applications.

Tested on 2 MBP without problem.

Edit: The 11.3.1 released a few hours ago still have the problem.

Edit 2: Xcode 13 b1 fixes the problem (even with MacOS 11.4). I don't know why Apple have not released a new Xcode 12 with a LLDB fix !

Edit 3: Xcode 12.5.1 fixes the problem for me

View more solutions

Comments

[蘇哲聖]

I have the same problem, I have to wait about 2 minutes until the launch is finished!

[Benjamin Wen]

Yeah, takes forever to launch. I actually can't imagine how Apple testers pass this Xcode version.

[Cloud9999Strife]

I updated to Xcode 12.1 and after that to the latest beta of Big sur, it solved the issue for me, but my colleague did the same and it did not fix his issues. Very frustrating.

[user2330482]

Have you updated to 14.1? Maybe that's what your colleague didn't do yet, it solved it for me without using a beta.

[liudasbar]

Same issue on Xcode 12.5 (with iOS 15 support files) and iOS 15 Developer Beta 1

[CristianMoisei]

Thanks @manman, I had to delete the entire Xcode folder also after unpairing the device (as suggested in the thread you shared) but it fixed the issue in the end.

[Mofawaw]

For me, my app just crashes after waiting for 1 minute...

[manman]

Yes, unpairing device will cause a crash on Xcode 12. After trying many times, I found a way to not crash when unpairing: If your device and computer are already paired, make sure your device is not connected to your mac before opening Xcode. Launch Xcode project, enter Devices and Simulators, then connect your device, unpair your device if you see it. Hope this helps. @KaneCheshire

[Adam Bardon]

I did both steps, but the slow launch issue was still there. Tried one more time and now it's back to normal.

[MosTwanTedT]

Not working for me as well... after second try Xcode crashes.

[Charlie Pico]

Yup this did it! Thanks A LOT!

[Georg]

It's true that the app now starts as fast as before, but then debugging is not possible anymore. Which is kind of the point of running the app on the device.

[Dom Bryan]

This isn't a great solution as it stops the ability to debug

[Dom Bryan]

This isn't a great solution as it stops the ability to debug

[tomisacat]

@DomBryan Sure, it's only a workaround, definitely it will be bug fixed in the future version of Xcode.

[tomisacat]

@刘俊利 Yep, it disabled the debug function, it's only a workaround for current Xcode version.

[jxd]

Unpairing device didn't work for me either, even with all the suggested workarounds. Apparently there is a more reliable solution, that fixed it for me. I posted it below!

[Herr der Töne]

That did it for me, but I tried the "Unpair" method first. So there's a chance both steps are needed.

[刘俊利]

Worked in Xcode 12.1 and support for iOS 14.1, 14.0, 12.4.5, etc..

[CristianMoisei]

That's good to know @Benjamin Wen, glad to hear they fixed it in the latest versions.

[LGP]

@CharlyPico the order of the answers frequently change when up- or down-voted. Please give a link or proper description instead.

[NaveedUlHassan5]

I had the same problem in Xcode 12.1, and it still exists after updating it to Xcode 12.2

[Lorenzo]

I removed all the simulator and reinstalled but the same. So this solution doesn't help

[Lorenzo]

This is a workaround to deploy the App on the device but doest't solve the issue if you want to debug in the device

[Benjamin Wen]

@NaveedUlHassan5 and the iOS version? My Xcode is now 12.2, and it goes smoothly with iOS 14.1. I have not tried it with iOS 14.2 yet.

[NaveedUlHassan5]

iOS version 14.2, i found it's solution on apple's forum. Cabeaulac comment was helpful. developer.apple.com/forums/thread/651012

[DeveloperSammy]

Happened to me after upgrading device to iOS14.2. Strange thing is my iPad works fine ...

[frank]

@GakkieNL maybe it's just on iOS and not on iPadOS, I guess.

[L33MUR]

Agree! I updated to Xcode 12.4 and iPadOS14.4 and it solved the issue for me too

[firetrap]

Tried everything nothing works for me. Mac OS 11.3 and Xcode 12.5(12E262)

[fisher]

For me Xcode 13 b1 seemed to solve the issue on initial tries. However, I am now seeing the issue resurface on Xcode 13 as well..

[Abhishek Thapliyal]

this works for me, even deleting and ~/Library/Developer/Xcode/iOS DeviceSupport. Then simply reopen Xcode. not worked

[Sam]

Same here, xcode 13.0 beta 5 (13A5212), iPhone 11 running iOS 15. takes up to 3 minutes to launch the app. launching the app on iPhone running iOS 14.* works much faster..

[Olle Lind]

Works for Xcode 13. Thanks for saving me plenty of time, none of the above answers worked.

[multitudes]

I updated to Xcode 13.2 beta and I have the issue as well (macOS 11.5). Tried everything without success

[Artem]

how to do that in AppCode?

[Artem]

How to do that for AppCode?