iPhone XS users: Do you feel stuttering?
Notes: This problem occurs not only on my apps.
I feel stuttering when using my app, KQ MiniSynth at higher performance on my iPhone XS, iOS 12.1.4.
Sample rate: 48,000Hz
Buffer size: 64
Patch: FM Piano
With the same condition, there is no problem on iPad mini 3.
I also found the CPU load which is shown by AUM on iPhone XS is higher than that on iPad mini 3 when using various synth apps.
(Strangely, the load decreases when I add 4th Audio Unit to AUM.)
The issue occurs when buffer size is 64 on AUM.
For example, when using Bram bos Phasemaker as a Audio Unit with AUM, it stutters on iPhone XS but there is no problem on iPad mini 3.
This phenomenon is similar to the issue which occurred on iPad Pro 2018.
But people reported it has been solved.
Am I alone?
I reported this issue to Apple 12 days ago but no meaningful response has come yet.