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One item to note is that .j.j will put processing load on to the kdb+ process.
JSON also only has a limited set of datatypes which means you will need to write more q code to perform parsing/casting
- https://www.w3schools.com/js/js_json_datatypes.asp
- https://kx.com/blog/kdb-q-insights-parsing-json-files/
Using the c.flip distributes the serialisation work across your java processes/threads and minimizes the work kdb+ will have to do to deserialise/parse/cast.
kdb+ does have a multithreaded input queue mode (but it does have restrictions)