Lambda has performance issue

Question

We have an issue with our Lambda Runtime Node.js 14 and 128MB, until one month ago was working fine, that means Duration was under one second. Now, sometimes is working slowly (Duration 12 seconds) and sometimes with the same request is working smoot (Duration 0.5 seconds). On my local machine is always working fine, so I increased the Memory from 128MB to 512MB but the issue persist. What else can I check ?

Edit: The lambda is connecting to other AWS services, Secrets Manager, Postgres, SES. All of them are taking up to 4 seconds each in one session. All of these services are in the same region of AWS

Brettski-AWS · Answer

What is your Lambda function doing? Is it calling external APIs? Could it be that those are causing a delay that you're seeing?

Without knowing what the code is doing it's not easy to provide advice.

If it were me I would be using some sort of logging or tracing inside the code to see where the delays are happening.

Riku_Kobayashi · Answer

Hello.

How about setting up provisioned concurrency?  
Perhaps your Lambda is running slower due to cold starts.  
Setting provisioned concurrency helps reduce cold start latency.  
https://docs.aws.amazon.com/lambda/latest/dg/provisioned-concurrency.html  
> Provisioned concurrency – This is the number of pre-initialized execution environments allocated to your function. These execution environments are ready to respond immediately to incoming function requests. Provisioned concurrency is useful for reducing cold start latencies for functions. Configuring provisioned concurrency incurs additional charges to your AWS account.

Also, although this is not very relevant, Node.js14 is a deprecated runtime, so I recommend updating to a newer runtime version if possible.  
https://docs.aws.amazon.com/lambda/latest/dg/lambda-runtimes.html#runtimes-deprecated

Lambda has performance issue

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