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Using the RT Preempt kernel patch, if you care about latency.

Buffers.

Badly.

Only macOS has an architecture to deal with low-latency audio and video properly. Presumably iOS has some of those features as well, but it was on OS X that Apple did some deep architectural changes for proper low-latency audio and video.

It was admittedly several years ago, but I worked on a voice chat app for iOS and Android, and the behaviour on Android was horrifying. iOS had very consistent and great audio latency (approx 10ms if I recall). Android devices were all over the place; I think the worst one I tested was over 150ms.