http://jbylund.github.io/tags/performance/Recent content in Performance on Joe BylundHugo -- gohugo.ioen© 2026 Joe BylundMon, 07 Sep 2026 00:00:00 +0000http://jbylund.github.io/posts/00384_ilike-trap-postgres-planner/Mon, 07 Sep 2026 00:00:00 +0000http://jbylund.github.io/posts/00384_ilike-trap-postgres-planner/ILIKE on a trigram-indexed column was spending ~40ms in the query planner for every ~3ms of execution. The fix was two lines of SQL and one line of Python — but finding it required understanding what the planner actually does with ILIKE.http://jbylund.github.io/posts/00352_mana-symbol-rendering-regex/Wed, 02 Sep 2026 00:00:00 +0000http://jbylund.github.io/posts/00352_mana-symbol-rendering-regex/Replacing a per-symbol replaceAll loop with a single regex pass and a Map lookup cut mana symbol conversion time by 47×. The mechanism, the benchmark, and a gotcha with stateful regex.http://jbylund.github.io/posts/00224_postgres-index-strategies/Tue, 11 Aug 2026 00:00:00 +0000http://jbylund.github.io/posts/00224_postgres-index-strategies/The magic.cards table carries indexes of every type PostgreSQL offers. A tour of trigram GIN for substring search, GIN for JSONB containment, B-tree for numerics, hash for exact-match fields, and an expression index that unlocks a color identity query that otherwise requires a full table scan.http://jbylund.github.io/posts/00160_postgres-copy-loading/Tue, 28 Jul 2026 00:00:00 +0000http://jbylund.github.io/posts/00160_postgres-copy-loading/Switching from row-by-row inserts to PostgreSQL’s COPY protocol meaningfully cut import time. Why COPY is fast, how to stream data into it from Python, and two approaches to expanding a JSON blob into a typed row.http://jbylund.github.io/posts/00064_falcon-bjoern-web-framework/Sat, 27 Jun 2026 00:00:00 +0000http://jbylund.github.io/posts/00064_falcon-bjoern-web-framework/Why Sylvan Librarian uses Falcon and Bjoern instead of the FastAPI + uvicorn default: a preference for explicit, close-to-vanilla Python over framework magic.