The Sub-500ms Threshold: Why Voice AI Finally Feels Human
When phone latency drops below 500ms, callers stop perceiving an IVR robot and begin speaking naturally. Here is the modern streaming architecture making this possible.
Key Takeaways
- Human conversational turn-taking takes ~200–300ms; previous AI delays of 1.5s broke caller trust.
- Streaming Speech-to-Text (STT) + fast inference streaming + Text-to-Speech (TTS) pipelines now achieve 420ms roundtrips.