Hi Steve, > (eg, is [zoom>13] { #ways[...] } slower/faster than #ways[...][zoom>13] ?)
Does your layer setup actually looks like this? ie. one 'ways' layer pulling in the entire planet_osm_ways table? If so this will be problematic. Unlike MapCSS, filtering out objects with CartoCSS will not prevent them from being loaded. With Mapnik/TileMill you should be querying specific thematic subsets of the database for each layer. The layer setup plays an important role in performance, so knowing what that looks like in detail (number of layers, their contents, file/database type database queries, projections, etc) would help track down potential issues. > Does setting a layer invisible definitely prevent it being computed? TileMill/Mapnik will still check that hidden layers are valid each time the project is saved/loaded, however that is the only thing it will do. These layers shouldn't affect -- AJ Ashton
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