[habi]

But about 70% of all images are something like https://tile.openstreetmap.org/10/399/390.png, e.g. water...

[moffkalast]

> 7.8 TB, too much water.

That could be easily compressed by having all of these link to one water image though, no?

[habi]

Theoretically yes. But no person ever is going to look at all the tiles (on the highest zoom levels) in the sea, so they are not rendered by default, and only on demand.