LLM-generated Rust database rewrite runs 20,171 times slower than SQLite on primary key lookups; code compiles and passes tests but optimizes for plausibility over correctness.

Hōrōshi バガボンド on X: "Your LLM Doesn't Write Correct Code. It Writes Plausible Code." / X

One of the simplest tests you can run on a database:Doing a primary key lookup on 100 rows.SQLite takes 0.09 ms. An LLM-generated Rust rewrite takes 1,815.43 ms.It's not a misplaced comma! The rewrite is 20,171 times slower on one of the most basic database operations.EDIT: Several readers have confused this project with [Turso/libsql](). They are unrelated. Turso forks the original C SQLite codebase; the project analyzed here is a ground-up LLM-generated rewrite by a single developer. Running t...