AWS Lambda: Task timed out (Cold Start)

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# SAM template
MyFunction:
  Type: AWS::Serverless::Function
  Properties:
    MemorySize: 1024  # 512 -> 1024
    Timeout: 30

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AutoPublishAlias: live
ProvisionedConcurrencyConfig:
  ProvisionedConcurrentExecutions: 5

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// ハンドラー外で初期化（コンテナ再利用時に共有）
const AWS = require('aws-sdk');
const dynamodb = new AWS.DynamoDB.DocumentClient();

exports.handler = async (event) => {
  // dynamodbはすでに初期化済み
  return await dynamodb.get({...}).promise();
};

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Layers:
  - !Ref MyDependenciesLayer

MyDependenciesLayer:
  Type: AWS::Serverless::LayerVersion
  Properties:
    ContentUri: layers/
    CompatibleRuntimes:
      - nodejs18.x

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# VpcConfig を削除