# Upgrading XCode to 9.1 and iOS Simulator to iOS 11.1 has slowing down Appium-java based tests drastically **URL:** \ **Category:** Issues/Bugs\ **Created:** [November 29, 2017, 10:27am UTC](https://discuss.appium.io/t/upgrading-xcode-to-9-1-and-ios-simulator-to-ios-11-1-has-slowing-down-appium-java-based-tests-drastically/19840 "2017-11-29T10:27:07Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![laxmikantm](https://discuss.appium.io/letter_avatar_proxy/v4/letter/l/e495f1/32.png) [@laxmikantm](https://discuss.appium.io/u/laxmikantm)\ **Post date:** [November 29, 2017, 10:27am UTC](https://discuss.appium.io/t/upgrading-xcode-to-9-1-and-ios-simulator-to-ios-11-1-has-slowing-down-appium-java-based-tests-drastically/19840/1 "2017-11-29T10:27:07Z")
Upgrading XCode to 9.1 and iOS Simulator to iOS 11.1 has slowing down Appium-java based tests drastically. My set-up - Appium-ide: 1.2.7 - Appium command-line: 1.7.1 - IOS: macOS Sierra 10.12.6 - XCode: 9.1(9B55) - iOS Simulator: iOS 11.1 Previously it was as below & tests were running with speed XCode: 8.3 iOS Simulator: iOS 10.3 ---
**Author:** ![JAYESH\_BHOR](https://discuss.appium.io/user_avatar/discuss.appium.io/jayesh_bhor/32/5946_2.png) [@JAYESH\_BHOR](https://discuss.appium.io/u/JAYESH_BHOR)\ **Post date:** [November 30, 2017, 2:52am UTC](https://discuss.appium.io/t/upgrading-xcode-to-9-1-and-ios-simulator-to-ios-11-1-has-slowing-down-appium-java-based-tests-drastically/19840/2 "2017-11-30T02:52:47Z")
Even with real device also we are facing this issue with same set up. ---
**Author:** ![laxmikantm](https://discuss.appium.io/letter_avatar_proxy/v4/letter/l/e495f1/32.png) [@laxmikantm](https://discuss.appium.io/u/laxmikantm)\ **Post date:** [December 6, 2017, 10:20am UTC](https://discuss.appium.io/t/upgrading-xcode-to-9-1-and-ios-simulator-to-ios-11-1-has-slowing-down-appium-java-based-tests-drastically/19840/3 "2017-12-06T10:20:37Z")
Hey Guys, Is there any remedy/suggestion on this? Thanks ---
**Author:** ![laxmikantm](https://discuss.appium.io/letter_avatar_proxy/v4/letter/l/e495f1/32.png) [@laxmikantm](https://discuss.appium.io/u/laxmikantm)\ **Post date:** [December 19, 2017, 4:18pm UTC](https://discuss.appium.io/t/upgrading-xcode-to-9-1-and-ios-simulator-to-ios-11-1-has-slowing-down-appium-java-based-tests-drastically/19840/4 "2017-12-19T16:18:13Z")
> ---
**Author:** ![Venkatesh](https://discuss.appium.io/user_avatar/discuss.appium.io/venkatesh/32/5358_2.png) [@Venkatesh](https://discuss.appium.io/u/Venkatesh)\ **Post date:** [December 20, 2017, 8:00am UTC](https://discuss.appium.io/t/upgrading-xcode-to-9-1-and-ios-simulator-to-ios-11-1-has-slowing-down-appium-java-based-tests-drastically/19840/5 "2017-12-20T08:00:19Z")
This has been an issue since Apple moved from UIAutomation to Xcuitest. The slowness started from Appium 1.6 onwards. ---
**Author:** ![laxmikantm](https://discuss.appium.io/letter_avatar_proxy/v4/letter/l/e495f1/32.png) [@laxmikantm](https://discuss.appium.io/u/laxmikantm)\ **Post date:** [December 20, 2017, 9:36am UTC](https://discuss.appium.io/t/upgrading-xcode-to-9-1-and-ios-simulator-to-ios-11-1-has-slowing-down-appium-java-based-tests-drastically/19840/6 "2017-12-20T09:36:06Z")
Thanks for your input. Our tests were running pretty normal on XCUITest , Appium 2.7.x , iOS 10.3, XCode8.3.3 MacMini Sierra From April -2017 till Nov-2017. They became slower after we needed to upgrade to iOS 11.1 , XCode 9.x Kindly suggest in this case. Thanks ---
**Author:** ![VikramVI](https://discuss.appium.io/user_avatar/discuss.appium.io/vikramvi/32/116_2.png) [@VikramVI](https://discuss.appium.io/u/VikramVI)\ **Post date:** [December 20, 2017, 10:16am UTC](https://discuss.appium.io/t/upgrading-xcode-to-9-1-and-ios-simulator-to-ios-11-1-has-slowing-down-appium-java-based-tests-drastically/19840/7 "2017-12-20T10:16:23Z")
You can do few things here to improve performance - [https://github.com/facebook/WebDriverAgent/wiki/How-To-Achieve-The-Best-Lookup-Performance](https://github.com/facebook/WebDriverAgent/wiki/How-To-Achieve-The-Best-Lookup-Performance) - if still there is slowness then file a bug ---
**Author:** ![laxmikantm](https://discuss.appium.io/letter_avatar_proxy/v4/letter/l/e495f1/32.png) [@laxmikantm](https://discuss.appium.io/u/laxmikantm)\ **Post date:** [December 20, 2017, 1:45pm UTC](https://discuss.appium.io/t/upgrading-xcode-to-9-1-and-ios-simulator-to-ios-11-1-has-slowing-down-appium-java-based-tests-drastically/19840/8 "2017-12-20T13:45:43Z")
Yes. Tried all of it but its still running very slow & app is crashing. Whereas it runs all fine on older simulator 10.3.1. How & where to report this issue? ---
**Author:** ![VikramVI](https://discuss.appium.io/user_avatar/discuss.appium.io/vikramvi/32/116_2.png) [@VikramVI](https://discuss.appium.io/u/VikramVI)\ **Post date:** [December 21, 2017, 2:25pm UTC](https://discuss.appium.io/t/upgrading-xcode-to-9-1-and-ios-simulator-to-ios-11-1-has-slowing-down-appium-java-based-tests-drastically/19840/9 "2017-12-21T14:25:12Z")
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