[Tile-serving] [openstreetmap/osm2pgsql] Long import of Europe data file (#676)

[Frederik Ramm]

The fastest way to complete this import is buying a 512 GB SSD drive with next-day delivery, putting that into your server tomorrow, and then restarting the import. Re. the "hand-crafted Mercator conversion", OSM data needs to be converted into "sphercial Mercator" coordinates when imported. "-m" uses built-in C/C++ code to make this conversion, whereas "-E 3857" uses an external library (proj4) to do the same, hence it will be slightly slower. But frankly I don't believe it will make a difference in your case since you've got plenty of CPU idly waiting for the disk to complete an operation.

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