### Answer To reduce the response time after a caller stops talking, you can adjust the

responsiveness

parameter on your voice agent. [(1) ]() This parameter controls how responsive the agent is, with a value ranging from

[0,1]

. - Lower value = less responsive (waits more, responds slower) - Higher value = faster exchanges (responds when it can) Set it to

1

for the fastest response time. Example when creating or updating an agent:

json
"responsiveness": 1

If you're still experiencing delays even with

responsiveness

set to

1

, you may also want to: 1. Use a faster LLM model - GPT-4.1 or similar low-latency models can help reduce response time [(2) ]() 2. Check

stt_mode

- Setting this to

"fast"

prioritizes latency over accuracy for speech-to-text [(1) ]()

json
"stt_mode": "fast"

Note: Some users have reported that the first response in outbound calls can have higher latency than subsequent responses, which may be a separate issue from the responsiveness setting. [(2) ]() [(9) ]()

​ To learn more, see the sources I considered: [[1] Update Voice Agent](https://docs.retellai.com/api-references/update-agent) [[2] Long time to Respond](https://discord.com/channels/1186424376300679209/1396968460231376896) ​

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