Xcode 9 Simulator slow

Question

Xcode 9 iOS 11 simulator extremely slow when app is run for the first time. Has anyone experienced the same? Slow Animations feature of the simulator has already been unchecked.

Answer 1

Yeah, it’s just a bug in Xcode

There is a bug in OpenGLES.framework in the iOS 11/tvOS 11/watchOS 4 Simulators that causes them to skip loading the LLVM JIT and fall back to interpreting shaders. This has a severe performance impact on the Simulator since it is entirely software-rendered OpenGL (this includes CoreAnimation, SceneKit, etc).

you need to swap in OpenGLES.framework from Xcode 9b3

As a temporary workaround you can copy libCoreVMClient.dylib from Beta 3 into the Xcode 9 GM and xcode 9.0.1

For iOS this is located at:

Xcode[-beta].app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/OpenGLES.framework/libCoreVMClient.dylib

For tvOS this is located at:

Xcode[-beta].app/Contents/Developer/Platforms/AppleTVOS.platform/Developer/Library/CoreSimulator/Profiles/Runtimes/tvOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/OpenGLES.framework/libCoreVMClient.dylib  

For watchOS this is located at:

Xcode[-beta].app/Contents/Developer/Platforms/WatchOS.platform/Developer/Library/CoreSimulator/Profiles/Runtimes/watchOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/OpenGLES.framework/libCoreVMClient.dylib  

Please check below link:

Apple Developer Forums

Xcode 9 Simulator is very slow