Lovable’s OJ Rewrites Vite’s Dev Server in Rust as AI Lowers the Cost of Forking Open Source
Brief
Lovable is beginning to replace Vite inside its cloud preview environments with OJ , a Rust-based build tool created for the demands of running around one million short-lived development sandboxes per day.
The company reported that OJ reduced median sandbox acquisition time from 14. 5 seconds to 3 seconds and cut the memory used by the dev server process by roughly 6. 5x in a controlled production rollout.
OJ arrives as part of the trend toward rewriting JavaScript tooling in Rust. Other examples include pnpm 12’s Rust rewrite , SWC, Biome, Oxc, Rolldown, and parts of Turbopack.
pnpm’s Rust rewrite was led by its original maintainers. Rspack preserves much of webpack’s configuration and API , while Biome offers a Rust-based formatter with high Prettier compatibility .