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Dev.to
6/25/2026
Spatial Search Performance: How I Got 100x Faster Queries With PostGIS and Redis GEO

Spatial Search Performance: How I Got 100x Faster Queries With PostGIS and Redis GEO

Short summary

Author optimized location-based queries from 8s to 30ms using two techniques: storing coordinates in WGS84 but querying in Web Mercator projection for accurate distances, plus Redis GEO caching for hot regions. The combined strategy achieved ~260x speedup with full Go/GORM code examples included.

  • •Store spatial data in WGS84, query in Web Mercator projection for accurate distance calculations
  • •Layer Redis GEO caching on top of PostGIS to avoid repeated database hits for popular regions
  • •Combined optimization reduced query time from 8 seconds to 30ms (~260x faster)

Generated with AI, which can make mistakes.

#open-source
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