<p>You are definitely doing an important job. Speeding up Overpass API and finding faster ways of working with it is obviously useful. I am trying to map your numbers on the current history page of OSM, which displays 20 changesets at once. And that gives me 3-5 seconds <em>for a user</em>.</p>
<p>I don't know the average size for a geojson-ed changeset, but if it is under 100k (which means under 10k gzipped: changeset jsons are very verbose), that would require under 500 GB for all the changesets, which is smaller than a rendering database.</p>

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