----------------------------- **While I generate an answer, here are some sources that might be helpful**: * [Outbound Calling]() * [Web Calling]() * [Dashboard]() * [Inbound Calling]() -----------------------------

### Answer Latency issues with PlayHT when used in Vapi can be influenced by several factors, and pinpointing the exact cause can be a bit complex. It's important to consider that both Vapi and PlayHT have roles in the overall latency of the system. 1. **Vapi's Role**: Vapi is designed to optimize latency through various measures like end-to-end streaming and server colocation, aiming to keep the voice-to-voice latency very low [(1)]() . However, Vapi relies on third-party providers like PlayHT for text-to-speech services, which means part of the latency could be introduced outside of Vapi's direct control. 2. **PlayHT's Role**: As a third-party provider, any delays or performance issues on PlayHT's end can directly impact the latency experienced on Vapi. This includes how quickly PlayHT can process requests and return audio data [(2)]() . Challenges such as network delays, server load at PlayHT, or issues with specific voices or settings can contribute to increased latency. 3. **Integration Configuration**: The configuration of how PlayHT is integrated within Vapi, including the choice of voices and any specific settings used, can also influence latency. Misconfigurations or using settings that lead to longer processing times can increase overall latency . To diagnose and address latency issues effectively, it may involve reviewing the configuration settings on Vapi for the PlayHT integration, monitoring the performance metrics provided by both Vapi and PlayHT, and possibly conducting tests with different settings or during different times to pinpoint the source of the issue. If the latency inconsistencies persist, it might be beneficial to contact both Vapi and PlayHT support teams for a more thorough investigation into the specific causes and potential optimizations , [(1)](http

s://docs.vapi.ai/audio-interface) .