[Tile-serving] Fwd: Mysterious mod_tile/mapnik bottleneck seems to be in save_as_png8

[Paul Norman]

On 7/2/2016 5:01 AM, Peter Devoy wrote:
> Hi all
>
> I am setting up a tile server and with all layers disabled am getting
> TTFB latencies from 2ms all the way up to 600ms.
>
> Might anyone know why this is please?  I have posted some details in
> the help section:
>
> https://help.openstreetmap.org/questions/50541/mysterious-mod_tilemapnik-bottleneck-seems-to-be-in-save_as_png8
 From the information you've given, it's something to do with the 
background you're using. Without having more details about that, it's 
hard to comment.

The bottleneck seems to be in Mapnik, so you're best off raising the 
issue there.