"Latency budget for a sub-500ms voice agent: ASR partial hypotheses ~120ms, LLM time-to-first-token ~210ms, TTS first chunk ~90ms, network+jitter ~60ms. Most demos skip this math entirely.
TTS is rarely the bottleneck in voice agents. Everyone tunes the voice model and ignores that they're waiting on a full LLM response before synthesis even starts. Stream sentence-level into TTS instead — you lose a little prosody continuity, gain ~600ms.
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