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The Retell platform achieves latency as low as 600ms, measured from when the user stops speaking to when the AI agent begins responding. In the agent detail page, under the “Estimated Latency” section, you can view the average latency for the agent.
Agent header showing estimated latency with a breakdown for TTS, LLM, and transcription

Estimated Latency

Please note that certain settings will increase latency. These settings are marked with a turtle icon. For example, any wait added by the Response Wait time setting appears as its own row in the breakdown.
The Response Wait time setting in Speech settings with a turtle icon beside its label. A tooltip anchored to the icon reads 'When tuned down, the latency will increase', and the slider sits at the far right showing 0.4s.

Turtle-marked settings show a latency warning on hover.