Z9 tiles are too slow to render #644
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Phyks
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Mar 4, 2023
Z9 was quite anomaly in terms of rendering time. It was taking much longer than Z8 and Z10 during pre-computation. Dominant layer was landuse_gen0. It was using subpixel rendering for landuse, which is useful at very low zoom but seems to be safely discardable at Z9. See as well gravitystorm/openstreetmap-carto#2874 and gravitystorm/openstreetmap-carto#3458 (comment). See #644.
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Phyks
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Mar 4, 2023
Z9 was quite anomaly in terms of rendering time. It was taking much longer than Z8 and Z10 during pre-computation. Dominant layer was landuse_gen0. It was using subpixel rendering for landuse, which is useful at very low zoom but seems to be safely discardable at Z9. Also add checks between way geometries and bbox to ensure correct usage of geospatial indexes in db. See as well gravitystorm/openstreetmap-carto#2874 and gravitystorm/openstreetmap-carto#3458 (comment). See #644.
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Precomputing up to Z8 takes a few hours worldwide.
Precomputing Z10 takes few hours worldwide.
Precomputing Z9 takes more than 12 hours worldwide.
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