XML data feed load & process

Hi All,
What is the quickest way to load & process approx 5,000 rows provided as an XML feed? It’s frequently updated near real time data so performance is paramount.
Of the 5000 rows, approx 80% will already exist & not required, and 20% inserts. No deletes needed.
Processing this in Bubble is taking 10-15min which is too long. It needs to be seconds.
Is it possible to use a 3rd party external side-car database/processor to pass through the delta/insert records only?

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Did you ever make any headway on this?