Loop over all nodes, and: *Store the node in a different cache database* If a node has tags, store in the collection Loop over all the ways, and: *Look up locations for each node in the cache database* Store the way into the collection London: cache_demo.nodecache: 45.1MB — demo.poiConcat: 84.2MB Miami: cache_demo.nodecache: 166.6MB — demo.poiConcat: 22.4MB https://github.com/derickr/3angle