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Better JIT for Postgres
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Overview
pg_jitter is a lightweight JIT compilation provider for PostgreSQL that introduces three alternative JIT backends: sljit, AsmJit, and MIR. It enhances query execution speed and compilation efficiency for PostgreSQL versions 14 to 18, addressing performance issues related to expression-heavy workloads and wide tables.
Summary from github.com.
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github.com
Better JIT for Postgres
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Community reactions
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Hacker News · github.com
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Based on 5 sampled comments from this thread. Analyzed 2026-03-04.
- Praise: The exploration of JIT frameworks for PostgreSQL indicates a growing interest in optimizing query performance, which could lead to significant improvements in database efficiency.
- Praise: There is potential for AI to contribute to developing bespoke compilers for PostgreSQL, which could tailor optimizations to specific architectures and enhance performance.
- Concern: The standard LLVM-based JIT is criticized for being slow at compilation, limiting its effectiveness for many queries and suggesting a need for better alternatives.
- Concern: Disabling JIT in PostgreSQL has been found to be a better default choice by some users due to significant slowdowns in query performance, raising concerns about its reliability.