Xcode Simulator animations extremely slow when played in editor

Question

Recently I have experienced, that Xcode's simulator has become extremely slow. Also if I create a new app and run it i, the transition between the launch screen and the first view controller takes about 3 seconds. Luckily it is only the iOS 9 simulator and not iOS 8 or lower. I have upgraded to Xcode 6.4 and I also have Xcode 7.0 beta 3 installed. Has anyone experienced the same? I have tried to uninstall both Xcode versions, but it didn't help.

Solution 1

If you press command+T it triggers the 'Slow animations' feature. I didn't noticed this setting until now. Doh!

Solution 2

In Simulator menu, go to Debug > Slow Animations , and uncheck this option or simply do:

⌘ + T

Solution 3

XCODE 9 BUG. This is officially confirmed to be an issue with Xcode 9.0 and its iOS 11 simulator — it affects any OpenGL-using application.

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

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

:( Hope this helps.

Solution 4

Currently only iOS11 simulator is slow.

You can download additional iOS10 simulator which works perfectly.

Choose Xcode -> Product -> Destination -> Download simulators... Then select any iOS10 simulator from the list (e.g. 10.3.1).

After that you will choose iOS version for most devices:

Solution 5

This has been fixed in Xcode 9.1 beta 2

Fixed an issue in Simulator’s OpenGL that could cause SceneKit apps to run slowly and the CPU to hit 100% when attempting to pan in an MKMapView.

View more solutions

Comments

[User]

Also noticing this. The first launch takes forever, then it will not start the app, have to run it again. After that it's quick. Still very annoying.

[C.J.]

As for me, the simulator is getting slower and slower. What garbage.

[Mike Keskinov]

Xcode 9, FPS = 1 all the time. ???? Xcode 8 all works fine (FPS 30)

[raykin]

so how to fix it? select image is pretty slow

[arcseldon]

Followed the link provided, but found no mention of El Capitan being a known issue. Please can you clarify which section you are referring to.

[bruce1337]

I read this answer and thought, "Hahaha, that's ridiculous! I don't even remember pressing Command-T to begin with lol" Then I pressed Command-T and everything went back to normal.

[Hayi Nukman]

lol,, that's ridiculous,,, I thought something is wrong with my apps... but after found this answer it's make me laugh....

[user3204765]

Me too... I was suffering for a week before I read this Commant-T (slow animation) feature.

[AJ.]

Wow. I use Cmd+T in the browser to open a new tab. I guess I pressed it too soon before I switched from the sim to the app. Thank you so much for pointing this out. Doh!!!

[Kumar Vivek]

I understand why this feature exists but there really should be some type of indicator that "slow mode" is enabled :)

[WillKre]

I wish I saw this answer before changing all my react native components thinking they were bugged! Time to git reset --hard that mofo, TY!

[Tom]

Always assumed that the simulator was just super slow. Turns out I've had this mode on since I started using it!

[paulo62]

If you select "Debug" in the Simulator menu, you will see the item "Slow Animations" which is ticked when selected

[mr5]

Might be you guys wanted to open new tab (CMD + TAB) in your browser but the current active window is set to iPhone Simulator

[Michael]

Thanks, updated to XCode beta 9.2 and its much better now, react-native-maps work too :)

[Jake T.]

Wow... I've been complaining for 6 months about the simulator being unusably slow, and found tons of stuff about it being slow due to bugs on Apple's end, and after all this time, it was because I tried to open a new tab while the simulator, rather than my browser, was the open window... So glad I decided to look into this and see if here's any news.

[grantespo]

Why would Apple even have this 'enabled'?

[yitwail]

Just wish I'd googled this topic earlier. I just assumed my 2015 MBP wasn't up to the task.

[Omar]

this fixed the problem for me