Why is WASAPI so much slower than ASIO?

Question

I measured the round-trip latency of RtAudio Duplex Mode example by an oscillograph. The result on the average as blow,

ASIO 15ms

WASAPI 50ms

Why is WASAPI so much slower? All documents on the Internet says them have the same performance.

OS: Windows 7 Ultimate

Compiler: VC2013

Did you use WASAPI [Exclusive-Mode Streams](https://learn.microsoft.com/en-us/windows/desktop/coreaudio/exclusive-mode-streams) for low latency targeting tests? — Roman R., Feb 01 '19 at 12:59
So it's RtAudio "slow" because it does not offer support for exclusive mode streams then. — Roman R., Feb 02 '19 at 14:32

score 0 · Answer 1 · answered Jul 19 '19 at 17:14

0

One reason is that you're using Windows 7. Give Windows 10 a try; this has some latency improvements

answered Jul 19 '19 at 17:14

Matthew van Eerde

1 Answers1