[Tile-serving] [openstreetmap/osm2pgsql] Why so slow, even after upgrading to full SSD system and doubling RAM to 32Gb? (#883)

[mboeringa]

> I thought that, once imported, tiling should be (blazingly) fast, so where do you think the problem might lie and what should a normal tiling performance be?

The first couple of zoom levels cover vast parts of the earth in a single tile, _and thus potentially vast amounts of data_, depending on your style. They are expected to generate tiles slowly, but also to have few tiles in total, so it doesn't matter it takes relatively long to render a single tile, as they are usually not updated as frequent as higher zoom levels.

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