[Tilesathome] Potential t at h optimization: Re-use the optimized .png image

[Matthias Julius]

"Ævar Arnfjörð Bjarmason" <avarab at gmail.com> writes:

> I find it difficult to imagine a state where the planet would be
> filled up in this manner. The majority of it is not urban area and
> thus the most of our tiles will be otherwise empty apart from a single
> road, a river or a few huts. Even in a hypothetical future state where
> the planet has been fully mapped. But this is all awfully speculative
> when discussing the code that's in use /now/ :)

On the other hand these areas are pretty static.  They are besically
only re-rendered when someone decides that we need to re-render the
whole planet.  Therefore, client performance might not be that much of
an issue.

If on the other hand someone decides to fill in all those forests,
glaciers and other large areas that are now blank, that could have a
significant impact on the tile store on the server.

Matthias