iOS app performance degraded on iOS 4.3?
iOS app performance degraded on iOS 4.3?
- Subject: iOS app performance degraded on iOS 4.3?
- From: Doug McCoy <email@hidden>
- Date: Thu, 24 Mar 2011 15:31:23 -0700
I have an iOS app that I have been working on for several months and I have got it to the fine tuning stage almost ready for release. It is a realtime audio app that uses the RemoteIO audio unit for realtime I/O. The app has realtime DSP between the input and the output so there is a bit of work being done in the callback.
The thing is, it has been working well on all devices 3gS and newer. That is, until iOS 4.3. On the 3gS device with iOS 4.3 there is terrible audio distortion when the app is doing the peak work. The i/o is fine when the cpu load is less, but when the app is working hard, distortion occurs. This makes me think it is related to cpu load. Missing the callback deadline and such.
Using the same build, same app, same everything on a 3gS device running iOS 4.1, the app works perfectly, as it has in all recent testing before the upgrade to iOS 4.3. So the only difference is the iOS version.
Is there any known issue with audio performance on older devices with iOS 4.3?
Please help.
Doug
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