What I Learned About Latency While Building a Real-Time Voice AI Agent When I started building a real-time voice AI agent, I thought about latency mostly as an engineering problem. Reduce the delay. Make the response faster. Stream audio as quickly as possible. That is still true. But after working on RingBooker , an AI receptionist for salons, spas, med spas, and beauty clinics, I started to think about latency differently. Latency is not only a technical metric. On a phone call, latency is part of the user experience. A small delay feels bigger on the phone In a web app, a short delay is usually fine. A button can show a loading state. A page can display a spinner. A chatbot can show typing dots. The user understands that something is happening. A phone call does not have that same visual feedback. When the caller stops talking and the AI does not respond, even a short pause can feel strange. The caller may wonder: “Did it hear me?” or: “Is the call still connected?” That emotional reaction matters.…