Why it's fun to hack on Postgres performance with Tomas Vondra

Why would anyone willingly spend weeks chasing a slow query, knowing they might hit dead ends along the way? In Episode 36 of Talking Postgres, Tomas Vondra—Postgres committer and long‑time performance contributor—joins Claire to explain why hacking on Postgres performance is not just hard, but also fun. We dig into the process of investigating why queries are slow, how iteration and “wrong turns” are part of performance work, and why Tomas prefers meaningful performance puzzles over toy problems. Along the way, we talk about using benchmarks to build an understanding of a problem. Tomas also shares how even small changes in code can have outsized impact when that code is used a lot, and how the mathematics embedded in the Postgres query planner/executor makes the work especially rewarding.Previously on Talking Postgres:Talking Postgres Ep31: What went wrong (& what went right) with AIO with Andres FreundTalking Postgres Ep24: Why mentor Postgres developers with Robert HaasLinks mentioned in this episode:PGConf.dev 2026: ScheduleGitHub repo: PostgreSQL Monthly Hacking Workshop, organized by Robert Haas Nordic PGDay 2026: Tomas talk on approximating percentilesVideo of POSETTE 2025 talk: Performance Archaeology – 20 years of improvementsVideo of PGConf EU 2025 talk: Fast-path locking improvements in PG18Conference: Prague PostgreSQL Developer DayDiscord: PostgreSQL Hacking DiscordGitHub repo: tvondra/tdigestBrendan Gregg’s site: perf Linux profiler examplesDocs: pgbench for running benchmarks on PostgreSQLBlog: Tomas Vondra blogPostgres Patch Ideas: List on Tomas Vondra blogCalendar invite: LIVE recording of Ep37 of Talking Postgres to happen on Wed Mar 18, 2026