Query Performance Tuning

Snowflake performance comes from reading less, doing less, and not waiting. Reading less is pruning—good micro-partition shapes, selective predicates, and avoiding unnecessary columns. Doing less is the optimizer choosing cheaper joins, pushing filters early, and reusing caches and results. Not waiting is workload design: right-sized warehouses, burst handling with multi-cluster, and avoiding cross-team contention. Tuning, then, isn’t about mysterious knobs; it’s about confirming which of those three levers failed for a slow query and fixing that, not everything at once.