How to speed up AWS Lambda deployment for large dependencies?

DVA-C02 By islever Editorial Last updated Aug 7, 2026

Short answer

B Use Lambda layers to package and load dependencies.

Question

A company has built an AWS Lambda function to convert large image files into output files that can be used in a third-party viewer application. The company recently added a new module to the function to improve the output of the generated files. However, the new module has increased the bundle size and has increased the time that is needed to deploy changes to the function code. How can a developer increase the speed of the Lambda function deployment?

Use AWS CodeDeploy to deploy the function code.
Use Lambda layers to package and load dependencies. Correct Answer
Increase the memory size of the function.
Use Amazon S3 to host the function dependencies.

Key Takeaways

This question tests understanding of Lambda deployment optimization through dependency management, with the common trap being confusion between deployment tools (CodeDeploy) and packaging strategies (Layers).

AWS Lambda layers allow developers to separate large dependencies from the function code, significantly reducing deployment package size and upload time. Community consensus confirms this is the standard best practice for optimizing Lambda deployment speed.

Common mistake: Candidates often choose option A (AWS CodeDeploy) thinking deployment automation tools will speed up the process, but CodeDeploy doesn't address the root cause of large bundle sizes—it only automates the deployment workflow.

Expert Analysis

Understanding the Core Problem

The question presents a scenario where a Lambda function's bundle size has increased due to a new module, resulting in longer deployment times. The key phrase here is "increased the bundle size"—this directly points to a packaging issue, not a compute or deployment automation issue.

Why Lambda Layers Are the Correct Solution

Lambda layers (Option B) are specifically designed to address this exact problem. By moving large dependencies into a separate layer:

The deployment package size is reduced to only contain the function's core code
Dependencies in layers are cached by AWS and don't need to be re-uploaded with every code change
Only the function code (typically small) needs to be uploaded during deployments
Layers can be versioned independently and shared across multiple functions

As community member SerialiDr noted: "By moving the large module or other dependencies to a Lambda layer, only changes to the function's own code need to be uploaded during deployment."

Why Other Options Are Incorrect

Option A (AWS CodeDeploy): While CodeDeploy automates deployments and supports Lambda, it doesn't reduce bundle size or upload time. It simply orchestrates the deployment process. The bottleneck here is the upload of large packages, not the deployment mechanism.

Option C (Increase memory size): Memory allocation affects execution performance, not deployment speed. This is a common confusion between runtime optimization and deployment optimization.

Option D (Amazon S3 for dependencies): While you can store code in S3, Lambda still needs to download and package everything into the deployment artifact. This doesn't solve the fundamental issue of large bundle sizes during deployment.

Real-World Application

In production environments, Lambda layers are essential for managing dependencies like image processing libraries (ImageMagick, Pillow), machine learning models, or data processing frameworks. This separation of concerns is a fundamental AWS best practice.

Official Reference

These links open the official vendor documentation in a new tab.

Exam Strategy

When you see keywords like 'bundle size', 'deployment time', or 'package size' in Lambda questions, immediately think about Lambda layers. This is a direct mapping to the layer use case for dependency management.

Community Votes

100%

100% of anonymous learners picked answer B. Votes are pick records left by other test-takers — they are not the verified answer.

Discussion 6 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 6

SerialiDr 👍 2 Answered B

B. Use Lambda layers to package and load dependencies. Lambda layers are a way to manage your function's dependencies separately, reducing the size of the deployment package that needs to be uploaded when the function's code changes. By moving the large module or other dependencies to a Lambda layer, only changes to the function's own code need to be uploaded during deployment, which can significantly speed up the deployment process. This approach allows for more efficient management of libraries and dependencies, making deployments quicker and more streamlined without altering the function's memory size, which would not directly impact deployment speed, or relying on external services like Amazon S3 or AWS CodeDeploy in a way that doesn't specifically address deployment speed for large dependencies.
Abdullah22 👍 2 Answered B

Lambda layers allow packaging shared dependencies outside the function code, resulting in smaller deployment packages for subsequent updates. This significantly reduces the time required to upload the code to AWS during deployment.
Saudis 👍 1 Answered B

Keyword => increased the bundle size
65703c1 👍 3 Answered B

B is the correct answer.
CrescentShared 👍 3 Answered B

Must be B

Show 1 more comment

KarBiswa 👍 1 Answered B

Its a lambda layer scenario

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