AWS Lambda Cold Start Latency Issues with .NET Core 3.1 Function and DynamoDB
I've been researching this but I'm integrating two systems and Quick question that's been bugging me - I'm experiencing significant cold start latency with my AWS Lambda function written in .NET Core 3.1 that interacts with DynamoDB..... I have deployed the function using the AWS Toolkit for Visual Studio, and while the function performs well after the initial invocation, the first call takes upwards of 5 seconds to respond, which is unacceptable for my use case. I've tried enabling Provisioned Concurrency, but it seems to only partially alleviate the issue. Here is the relevant configuration for my Lambda function: ```json { "FunctionName": "MyLambdaFunction", "Handler": "MyLambdaNamespace::MyLambdaClass::MyHandlerFunction", "Runtime": "dotnetcore3.1", "MemorySize": 512, "Timeout": 30, "Role": "arn:aws:iam::123456789012:role/service-role/MyLambdaRole", "Environment": { "DynamoDBTable": "MyTable" } } ``` The invocation looks like this: ```csharp public async Task<string> MyHandlerFunction(APIGatewayProxyRequest request, ILambdaContext context) { var client = new AmazonDynamoDBClient(); var response = await client.GetItemAsync(new GetItemRequest { TableName = Environment.GetEnvironmentVariable("DynamoDBTable"), Key = new Dictionary<string, AttributeValue> { { "Id", new AttributeValue { S = request.PathParameters["id"] } } } }); return JsonConvert.SerializeObject(response.Item); } ``` I've also checked the AWS X-Ray tracing and it shows that the cold starts are primarily due to the .NET runtime initialization. I am considering switching to .NET 6 or optimizing my code further, but I wanted to know if anyone else has faced this issue and how they managed to reduce the cold start latency effectively. Any suggestions or insights would be greatly appreciated, especially regarding best practices for reducing cold starts in .NET-based Lambda functions. For context: I'm using Csharp on macOS. I'd really appreciate any guidance on this. Any pointers in the right direction?