PostGIS Performance Profiling
Blog post from Carto
The CARTO team is optimizing PostGIS performance, focusing on reducing database query execution time to improve map rendering speed. They've identified two key areas for improvement: Mapnik rendering and MVT (Vector Tile) rendering. To optimize Mapnik rendering, they've modified the `ST_AsTWKB()` function to minimize memory allocations for small objects like points, and changed the implementation of `ST_Simplify()` and `ST_RemoveRepeatedPoints()` functions to reduce copying data around. For MVT rendering, they've made changes to the `ST_AsMVTGeom()` function to avoid unnecessary copying and polygon validity checks, which resulted in significant performance gains. These optimizations aim to improve map rendering speed while maintaining performance for other use cases.
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