Type of request: This is a ...

[x] bug report
[ ] feature request

Detailed description

When running localstack on MacOS using the example docker-compose.yml, Lambda functions can take a long time to start up.

I think this is because of existing performance issues with osxfs, the file system server in Docker for Mac.

If your using LAMBDA_EXECUTOR=docker, the copying of zipped code to new lambci/lambda containers can take a very long time.

If you're using serverless-localstack, enabling mountCode solves the slow copying, but then actually requiring your code inside the lambda function can take a long time (mostly because of node_modules).

To solve this, I disabled mounting /tmp/localstack in my docker-compose.yml

    volumes:
      # - "${TMPDIR:-/tmp/localstack}:/tmp/localstack"
      - "/var/run/docker.sock:/var/run/docker.sock"

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Expected behavior

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Actual behavior

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Steps to reproduce

Command used to start LocalStack

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Client code (AWS SDK code snippet, or sequence of "awslocal" commands)

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