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Checked the network logs - it seems to perform an API query [0] which returns a stream of data, that's then computed upon on-the-fly in the browser.

That's right, it streams every search result match back to your browser and the Elm code on the frontend then calculates the stats live.

So the reason they bounce around is because new results are streaming in, and it's updating the chart live based on those.

After a little bit it will stop & have found all results