Slow import time for clients

[mk0sojo]

Checkboxes for prior research

• [X] I've gone through Developer Guide and API reference
• [X] I've checked AWS Forums and StackOverflow.
• [X] I've searched for previous similar issues and didn't find any solution.

Describe the bug

Currently upgrading from AWS SDK v2 to AWS SDK v3 and importing @aws-sdk/client-xxx is slower than I would expect and is causing very slow cold starts (close to 1 second).

SDK version number

@aws-sdk/client-dynamodb@latest, @aws-sdk/client-s3, @aws-sdk/client-ssm

Which JavaScript Runtime is this issue in?

Node.js

Details of the browser/Node.js/ReactNative version

Node 18 lambda

Reproduction Steps

1. In the AWS console create a new Node 18 lambda. Set the memory to 1024 MB
2. It is pre populated with the following code:

   export const handler = async (event) => {
   // TODO implement
   const response = {
   statusCode: 200,
   body: JSON.stringify('Hello from Lambda!'),
   };
   return response;
   };

3. Test run the code, this returns something like this:

   
   Response
   {
   "statusCode": 200,
   "body": "\"Hello from Lambda!\""
   }

Function Logs START RequestId: 12248941-44db-4e8c-93fa-458c0080ad45 Version: $LATEST END RequestId: 12248941-44db-4e8c-93fa-458c0080ad45 REPORT RequestId: 12248941-44db-4e8c-93fa-458c0080ad45 Duration: 2.66 ms Billed Duration: 3 ms Memory Size: 1024 MB Max Memory Used: 67 MB Init Duration: 172.79 ms

Init duration (cold start) here is 172.79 ms which is expected.

4. Now add a few imports to the top of the file so it looks like this:

import { DynamoDBClient, GetItemCommand } from "@aws-sdk/client-dynamodb" import { S3Client, GetObjectCommand } from "@aws-sdk/client-s3"; import { SSMClient, GetParameterCommand } from "@aws-sdk/client-ssm";

export const handler = async (event) => { // TODO implement const response = { statusCode: 200, body: JSON.stringify('Hello from Lambda!'), }; return response; };

5. Deploy and test. This will return something like this:

Response { "statusCode": 200, "body": "\"Hello from Lambda!\"" }

Function Logs START RequestId: fa753048-9567-4836-b9e7-278df1a9767f Version: $LATEST END RequestId: fa753048-9567-4836-b9e7-278df1a9767f REPORT RequestId: fa753048-9567-4836-b9e7-278df1a9767f Duration: 2.56 ms Billed Duration: 3 ms Memory Size: 1024 MB Max Memory Used: 115 MB Init Duration: 917.74 ms

Request ID fa753048-9567-4836-b9e7-278df1a9767f

The cold start time is now 917.74 ms. This seems quite large (and this is before creating any clients (and definately more than AWS SDK v2). Is this expected?

### Observed Behavior

Slow cold start time when importing AWS SDK clients.

### Expected Behavior

A bit faster?

### Possible Solution

_No response_

### Additional Information/Context

_No response_

[kuhe]

We recommend creating a bundled application if cold start times are a concern.

https://aws.amazon.com/blogs/developer/reduce-lambda-cold-start-times-migrate-to-aws-sdk-for-javascript-v3/

[mk0sojo]

When I bundle it it takes around 450 ms for a cold start which is similar to v2 I think.

[yenfryherrerafeliz]

@mk0sojo I am glad to hear that bundling the SDK helped you in reducing the cold start times. It is actually what we recommend as @kuhe said. I am going to resolve this issue now, but please if you have anything else that we can help you with, feel free of opening a new issue.

Thanks!

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