Slow Lex Responses

Question

Hello all;
We are using Lex (v1) with Amazon Connect. On Voice channel sometimes we get slow responses.

I checked **RuntimeSuccessfulRequestLatency** metric from Cloudwatch and got data as below. The ones marked with yellow has no lambda hooks, but they returned very slow. These are generally Yes/No questions with most 2-3 intents. I have  a voice recording of these and after user input lex waits around 4-5 second to respond.

How can we make lex respond faster?

Thank you

![RequestLatency](/media/postImages/original/IMTAKS7MyYSLyFIQh65CaItQ)

Answer

Hello,

Thanks for your response. All our resources are in us-west-2. Normally it takes 2-3 seconds, but sometimes it is peaking as you can see. And user on the call waits. We don't have this issue on chat. Only on voice channel.. I tested from Lex console as well. Its response is about 2 seconds.

Thank you

Answer

The latency you're seeing makes no sense. I get around 250 ms with NOT a yes/no bot. Any chance you Connect, Lex and lambda are in different regions or something like that? If you build a bot from scratch with no real configuration does it show the same latency?

david

Answer

Wow, that makes no sense. What do the conversation logs show in CW?

Answer

Amazon Lex bots will have a cold start after 24 hours with no traffic.  Check if this is the case, if it is then you can prevent this by scheduling a Lambda function to make a call to Lex every few hours (you can use Eventbridge for this). A simple PostText (Lex v1) should be fine for this purpose.

Slow Lex Responses

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