Try to put together all the calls followed by the sync, all of them inside the scope and at the end, after the sync, the catchall.

Sync is your friend! Declare it after calls and configure it to wait for the answers. 

https://docs.intersystems.com/irislatest/csp/docbook/DocBook.UI.Page.cls...

The problem with web applications is that sometimes the behaviour is a bit "stange", it's possible that the DTL page would be cached on explorer's memory and this makes it to work with errors.

Have you tried this? 

https://community.intersystems.com/post/how-do-you-change-namespaces-rou...

Performance in what functionality? Interoperability? SQL queries? Database configuración?

To do async calls shouldn't be a problem: 

https://docs.intersystems.com/iris20243/csp/docbook/DocBook.UI.Page.cls?...

What functionality do you need that is not covered by the community license?

It's a pleasure @Tani Frankel ! Congratulations for your great exercise!
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I think that @Laura Blázquez García is doing something similar to what you are asking for, using the DTLs of IRIS for Health to transform an ORU^R01 message into FHIR resources in a bundle, maybe you can send a message to her. 

Maybe dequeuing state is what you are looking for:

DEQ - Dequeue wait (currently unusued)

Record Map is used to parse rows from CSV files into Objectscript objects, you can use DTLs or by code directly to get the fields from the HL7 message and save into a string variable. Something like:

set myString = request.GetValueAt("PID:3.4.1")

In this case request is an Enslib.HL7.Message variable.

It's not working because the images looks like have been removed: https://containers.intersystems.com/contents

Does the file generated from pandoc (the initial output.pdf) readable?

Well, it really simplifies the task of search and deep dive into hundred of community articles to get a specific piece of code, in my case, how to export SQL Gateway configurations:

https://community.intersystems.com/ask-dc-ai?question_id=251638