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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Slow cloud request/response tagging in Docker Lambda function with datadog-lambda","articleBody":"Hi, not sure if this is the right place or it should rather go to ddtrace or somewhere else:\n\nReproduction repo with CDK: https://github.com/maxfriedrich/datadog-cloud-payload-tagging-repro\n\nThe cloud request/response payload tagging feature causes a big slowdown for us for any DynamoDB query, even when \"disabled\" with the environment variable value `\"$.*\"` (0.xx seconds to \u003e 10 seconds query), with the following setup:\n* Docker Lambda based on the Lambda Python 3.11 (or 3.13) base image\n* Installing the Datadog Lambda extension into the container\n* Installing datadog-lambda and ddtrace with into the container\n* Running the function with `datadog_lambda.handler`\n\n(this function outgrew the zip size limit, this is why it's built like this -- is this a supported setup?)\n\nWe can work around it by setting the environment variable values to `\"\"`, fully disabling the feature, not just redacting all fields.\n\nThe problem only occurs with a Docker based Lambda function, the handler from my reproduction is fine in the Python runtime and the Datadog extension and Lambda layers.\n\nOutput from my test script:\n\n```console\nTesting slow function: arn:aws:lambda:eu-central-1:...:function:DdTaggingReproStack-Function1904AA941-QLjJ2nwy96AV\nExecution time: 11.545 seconds\nExecution time: 10.865 seconds\nExecution time: 11.279 seconds\nExecution time: 11.604 seconds\nExecution time: 11.659 seconds\n\nTesting fast function: arn:aws:lambda:eu-central-1:...:function:DdTaggingReproStack-Function28EA0674A-36P7xO9x9CbG\nExecution time: 0.235 seconds\nExecution time: 0.188 seconds\nExecution time: 0.168 seconds\nExecution time: 0.194 seconds\nExecution time: 0.206 seconds\n```\n\nDo you have any ideas what could cause this? Feel free to move the issue if it belongs somewhere else. Thank you very much!","author":{"url":"https://github.com/maxfriedrich","@type":"Person","name":"maxfriedrich"},"datePublished":"2025-07-14T10:28:58.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/633/datadog-lambda-python/issues/633"}