​ To learn more, see the sources I considered: [[1] Troubleshoot high latency](https://docs.retellai.com/reliability/troubleshoot-latency) [[2] Check actual latency](https://docs.retellai.com/reliability/check-actual-latency) [[3] Retell AI Launches GPT-5 for Voice Agents – Higher Intelligence, Smarter Conversations | Retell AI](https://www.retellai.com/blog/gpt-5-now-on-retell-smarter-ai-voice-agents-with-reasoning-power) ​

### Answer If you're experiencing higher latency with GPT-4.1 nano and mini, here are the steps to troubleshoot: [(1) ]() Check your actual latency metrics: [(2) ]() - Monitor per-call latency through the dashboard's "Call History" section - Review the latency breakdown via the Get Call API to identify which component is causing the delay (LLM, TTS, ASR, etc.) Troubleshooting steps: [(1) ]() 1. Check Estimated Latency - Look for features marked with a turtle icon 🐢 in your configuration and check if your estimated latency exceeds 1.5s 2. Monitor LLM Response Time - Check your current LLM latency and compare against the normal range (500ms - 900ms) . If consistently above 900ms, consider switching to an alternative LLM provider or wait for your current provider to resolve performance issues 3. Check Status Page - Visit the [Status Page]() for any ongoing issues 4. Contact Support - If the above steps don't resolve your latency issues, locate your call ID and contact support with your call ID, steps you've already tried, and current latency measurements According to the expected performance benchmarks, GPT-4.1 Mini should have low latency around 550ms, and GPT-4.1 Nano should be around 500ms [(3) ]()

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.