When using a multibranch pipeline with streams...  The entire stream source is synced into a workspace directory called "xxx@script".  This is a huge waste of time and space as the only file needed is the Jenkinsfile.   I see no way to configure the project to filter the @script workspace.  

This may be unrelated, but my setup also includes a custom path to the Jenkinsfile, using the "script path" field with the value "components/template/Jenkinsfile".