Xcode Simulator animations are very slow when playing in the editor

Question

I recently experienced that the Xcode simulator has become very slow. Also, if I create a new application and launch it i, the transition between the launch screen and the first view controller takes about 3 seconds. Fortunately, this is only an iOS 9 simulator, not iOS 8 or lower. I upgraded to Xcode 6.4, and I also have Xcode 7.0 beta 3 installed. Has anyone experienced the same thing? I tried uninstalling both versions of Xcode, but that did not help.

Answer 1

If you press the + T command, it starts the Slow Animation function. I haven’t noticed this yet. Doh!

Answer 2

Xcode 9.0 / 9.0.1 / 9.2 + iOS 11 simulator:

If you have performance issues with Xcode versions: 9.0 / 9.0.1 / 9.2 iOS 11 Simulator with Spritekit game projects or with OpenGL related projects, this is a known bug:

An error in OpenGLES.framework broke JL LLVM, so all shaders return to interpreted execution. (Twitter)

Decision:

Apple fixed this in the release of Xcode 9.1, but now in 9.2 the simulator is slow again ... :(

This is a temporary solution until Apple fixes it in the next release of Xcode ... This simulator performance issue only exists if you select iOS 11 Simulator. iOS 10 Simulator does not have this error.

1.) Exit Xcode and the simulator

2.) Download libCoreVMClient.dylib from this link . If you don’t have Dropbox, select “No, thanks, continue browsing,” then click “Download.” Extract the zip, inside you will find the beta3 folder with the latest known libCoreVMClient working file. This is taken from Xcode 9 beta 3.

3.) Right-click the Finder icon, select "Go to Folder ...", then paste the following: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/CoreSimulator/Profiles/Runtimes/iOS .simruntime / Contents / Resources / RuntimeRoot / System / Library / Frameworks / OpenGLES.framework

4.) Replace the file "libCoreVMClient.dylib" here with the beta you downloaded, just overwrite and paste.

5.) Restart Xcode, now everything should be in order! :)

Answer 3

In the Simulator menu, go to Debugging > Slow Animation and uncheck this box or simply do:

⌘ + T

Answer 4

XCODE 9 BUG . This has been officially confirmed as a problem with Xcode 9.0 and its iOS 11 simulator - this affects any application using OpenGL.

See: https://github.com/mapbox/mapbox-gl-native/issues/9959

Also: https://twitter.com/xenadu02/status/911463433521860609

:( Hope this helps.

Answer 5

At the moment, only the iOS11 simulator is slow.

You can download an additional iOS10 simulator that works great.

Select Xcode → Product → Destination → Download simulator ... Then select any iOS10 simulator from the list (e.g. 10.3.1).

After that, you will select the iOS version for most devices:

Answer 6

This has been fixed in Xcode 9.1 beta 2

Fixed an issue in OpenGL simulators that could cause SceneKit applications to run slowly and the CPU 100% when trying to pan in MKMapView.

Answer 7

This is a known bug from the Apple developer, see the link below https://forums.developer.apple.com/thread/83570

Answer 8

I had the same problem, and scratching my head a bit, I realized that when I open the Xcode Organizer window, it behaves very slowly while the simulator is running. Therefore, for those who do not have the "slow animation" option, note that the "Organizer" window is not open.

Answer 9

I believe this is a problem with El Capitan, not necessarily Xcode 7 or iOS 9. https://developer.apple.com/library/prerelease/ios/releasenotes/General/RN-iOSSDK-9.0/index.html