[Tilesathome] tiles at home = mission impossible?

[Norbert Hoffmann]

Hi,

if I understand it right, lowzoom now works like this:

Generating levels 8-11 tries to read zoom 12 'captionless' for all needed
tiles. The servercode "sees" that most zoom 12 'captionless' are missing
and requests rendering for zoom 12. The client renders zoom 12
'captionless' (which is needed) + zoom 12-17 'tile' (which are not needed
but use most space and time).

The world at zoom 0 will be finished not before all 68,719,476,735 tiles
are rendered. 

To say it in days: All 16,777,216 zoom 12 tiles will need about 4 years if
nobody changes anything in the db or in the rules from now on (and the
rendering speed stays at about 500 per hour).

I think a change, that could help, would be to alter "MissingTiles" to
request only renderless if the access to a zoom 12 renderless tile doesn't
find the file on the disc. The client must be able to create and send only
this file.

Zoom 12-17 'tile' will only be rendered, if something is mapped or the tile
is looked at.

Norbert