There's not much advice I can offer here other than to take a look at this blog post. I'm not familiar (enough) with Go to provide specific advice but for most runtimes in Lambda I'd encourage "lazy invocation" of various libraries and startup components; or look at using provisioned concurrency (more information in the blog post).
When you invoke a Lambda function directly, the request is sent straight to the Lambda service. However, when you use a function URL, the request typically goes through API Gateway or an Application Load Balancer before it reaches the Lambda function. This extra hop adds an additional layer of processing and network latency, which can contribute to the increased cold start time.
There maybe some workarounds about this
- Make sure the API Gateway or Application Load Balancer and the Lambda function are in the same region to reduce network latency.
- Use provisioned concurrency for your Lambda function to reduce the cold start time.
- Optimize your API Gateway settings, such as caching and logging, to reduce the latency introduced by API Gateway.
- Review and optimize the configuration of the Application Load Balancer, such as target group settings and health checks, to reduce latency.
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