Unity 5.3 performance issue on specific iOS devices.

Unity 5.3 iOS build performance issue on selected devices.

Devices Tested on: iPhone4s, iPhone5, iPhone6, iPhone6s, iPad2, iPadMini
Devices working fine: iPhone4s, iPhone5, iPhone6s, iPad2
Devices giving low performance: iPhone6, iPadMini

Tested with unity's active profiler, the Overhead (CPU) is taking average time of 0.4-0.7ms on the working devices. But it takes upto 60-65ms on iPhone6 and iPadMini devices.
Build tested with both the latest patch release i.e. Unity 5.3.4p5 and the latest beta release i.e. 5.4.0B16, the problem still exists.

Tried a build with opengl es 2.0 as well, no noticeable difference.

The problem only exists in iOS build. I have tried on more than 4 android devices ranging from Sony Xperia J (4 years old model), Samsung S3 neo, OnePlus 2. The game works fine on all of them.

Is there any fix for this issue so far?

Thread about the same issue: http://forum.unity3d.com/threads/unity-5-2-ios-performance-issues.353646/
Bug report about the same issue: https://fogbugz.unity3d.com/default.asp?728361_pr79ufas4vfal1dj

 

Hi,
we're having the same issue. Our game runs fine on iPad2 and Android devices, but not on iPad Air.

http://forum.unity3d.com/threads/huge-peak-in-graphics-presentandsync.399251/#post-2629360

 

I also have this performance issue on iPod 5th Gen. In my case iPhone6 has no problem.

This is a iPod 5G Profiler result.
As you can see Camera.render took less than 6ms and that's well below 60fps. But that Graphics.PresentAndSync makes my game useless on iPod.
On iPhone6 the game runs smooth(without Graphics.PresentAndSync)

 

Thanks for posting! Is your scene simple as ours? Could you test this simple project here? http://forum.unity3d.com/attachments/simple_test-unitypackage.184807/

thanks

 

Tested your project. It runs smooth on iPod 5G. There weren't hiccups also.

 

Thanks @NGC6543, we tested on iPhone 5C and it runs nice too. The problem for us is on iPad Air, we didn't have the Air 2 to test.

 

I am experiencing brutal random overhead spikes with iPhone 6 Plus. :-/ Profiler says nothing (empty gap)...