This is a Bug Report

We used to use npm to install our dependencies. Now we use yarn. When deploying with modules installed through npm, it takes sub 1 minute for the "Excluding development dependencies..." step. When doing the install with yarn we see 10+ minutes for the step.

What exactly happens in this step and how can we improve the times here?

Description

• What went wrong?
  Deploy takes to long. In particular the step "Excluding development dependencies...".

• What did you expect should have happened?
  The deploy should not make circle ci time out...

• What was the config you used?
  Not relevant. But it's massive.

• What stacktrace or error message from your provider did you see?
  No error. Just timeout.

Additional Data

• Related Issues:
  excludeDevDependencies: true adds >8 minutes to deploy? #4426
  serverless package is very slow #4263
  forum#3685

• Serverless Framework Version you're using:
  1.34.1

• Operating System:
  linux, in particular same as what aws lambda runs on (yes, that's where we deploy from)

Note: We can not use excludeDevDependencies: false since our dev dependencies are massive and lambda has a size limit.