.Net Core is unexpectedly slow

Symptoms

An image using .Net Core is unexpectedly slow.

Cause

The official Docker images for .Net Core occasionally have performance issues.

Solution

1. Attempt to run the image and tests locally.

• If the issue persists, continue.
• If the issue does not persist, see our performance troubleshooting articles.

1. Create a custom image including only the SDK and any other tools required.

This allows a smaller image and is often known to create better performance.

Notes This does not apply to all versions of Dotnet. 3.1 is known to occasionally have this problem.

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Create a base image