Hey, that was before we had the new Convert methods!
The new methods should be much faster and you can use Dictionary/Array/Variant.
I made a blog entry:
https://mbs-plugins.de/archive/2019-07-06/RecordSet_to_JSON_and_back/monkeybreadsoftware_blog_xojo
It looks like it’s quite good on performance for RecordSet to JSON and back.