Voice AI
TTS Latency benchmarks for US & Canada
A benchmark report evaluating top TTS APIs, like Murf Falcon, ElevenLabs, OpenAI, Cartesia, and Deepgram, across regional latency and language performance. For those building voice agents, this study identifies the tools offering the optimal balance of speed and stability across North American markets.
Key Learnings
- Geographic Variance: Network topology creates 60-150ms variance in latency across different US and Canadian regions.
- Metric Standards: Global latency averages hide critical regional performance gaps that reach up to 30%.
- Language Dependency: Model efficiency fluctuates by target language, showing 10-19% latency differences for most providers.
- Stability Thresholds: A Coefficient of Variation above 0.30 signals unpredictable systems that threaten user experience.
