One of the easiest ways to start investigating why your AWS Lambda function is failing is to check the timeout setting allocated for the function. By default, the timeout is set to 3 seconds, which is often not enough for certain operations.
As shown in my screenshot, based on approximately 3,000 operations my code computed, a few of them took longer than 3 seconds to complete.
However, this doesn’t necessarily mean your code is poorly written or unoptimized. In many cases, the issue depends on what happens after the function executes. For example, if your function makes an API call to another service, the response time can vary significantly, and there’s little you can do to speed it up.