Cognito pre signup lambda timeout

Question

Hi,
I am trying to use pre-signup lambda for validation of user sign up. My lambda function will run more than 12s and not possible to optimize more than that. while testing through the hosted UI, I am experiencing lambda time out less than 5 to 7s (not sure provided approx.) is there any limitation on the service side of Cognito (or) is there any configuration that I possibly missed.

If it is service limitation how to proceed further and overcome the issue.

Igor Ivanovic · Accepted Answer

When Cognito invokes Lambda functions through these triggers, timeout is 5s. It is true for all the trigger types except for Custom Email Sender and Custom SMS Sender. This can be found in the documentation:
https://docs.aws.amazon.com/cognito/latest/developerguide/cognito-user-pools-working-with-lambda-triggers.html#important-lambda-considerations

Cognito pre signup lambda timeout

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