Stuttering / Motion hiccups on mobile when using Unity >= 4.6.3f3

Hello, i have recently upgraded our project from 4.6.3f1 to the latest version 4.6.5 and our Augmented Reality APP is jerky now.

It's an augmented app with webcamtexture involved (the webcam runs at 30fps). The app stutters if you move the camera around the augmented object.

I narrowed down the problem and found out that the problem appears beginning from 4.6.3f3 while 4.6.3f2 is still fine. As you see in the two profiles attached i have CPU spikes with all versions >= 4.6.3f3

If you look at the changes between 4.6.3f2 and 4.6.3f3 do you have any idea what might lead those CPU Spikes ?
Other threads have commented that vsync with Unity can be problematic sometimes too. Maybe its related to this. Did anything change in this context with 4.6.3f3 ?

I am testing on iOS7/8 & iphone5

Looking forward to your reply.

Thanks in advance,

Andre

Problematic Profile, published with >= 4.6.3f3



Profile published with <= 4.6.3f2 which works fine

 

Trying posting this in mobile section of forum also, iOS section as more visibility for devs,