`lambda/provided:al2023` images with `com.amazonaws.lambda.platform.version` set to `sbxv2ga` result in higher latency than ones with `com.amazonaws.lambda.platform.version` set to `sbxv2brave`

[rohitagarwal003]

I deployed a new version of my Go-based lambda which uses public.ecr.aws/lambda/provided:al2023 as a base image and noticed higher latencies. I did a bisect between the good version and the bad version and deployed various images between them to isolate the issue. I isolated the regression to be caused by the base image change. The same Go binary using public.ecr.aws/lambda/provided:al2023.2025.10.02.14 as the base image has higher latency compared to using public.ecr.aws/lambda/provided:al2023.2025.09.30.00 as the base image.

When I do a diff of the docker inspect output of the two base images, I notice:

             "Labels": {
                 "com.amazonaws.lambda.platform.kernel": "k510ga",
-                "com.amazonaws.lambda.platform.version": "sbxv2brave"
+                "com.amazonaws.lambda.platform.version": "sbxv2ga"
             },

I can't find more information about what sbxv2brave or sbxv2ga mean. Or whether it's something else inside the base image that's causing the latency regression. But there's a noticeable difference in latencies (both P50 and P90) when using the newer base image.

Here's a graph that shows the latencies (and my various attempts deploying different versions to isolate which change caused the increase):

[rohitagarwal003]

I filed a support case also: https://support.console.aws.amazon.com/support/home?region=us-east-2#/case/?displayId=176293184900150&language=en

[PartiallyUntyped]

Hi, thank you for the issue.

We are looking into this, and we hope to resolve the issue soon. The difference that you see is related to how the Lambda platform handles OCI images. I can't provide more details at the moment, but we are actively investigating the issue.