Relax Debuts Rust JIT Compiler Cutting Build Times to Seconds

1 reports archived1 independent sourcesupdated 11/12/2026, 05:20:01

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Relax is a live compiler and JIT runtime for Rust from the Makepad team that runs Cargo packages directly from source, bypassing rustc, LLVM and the linker by compiling functions on first call and hot-patching edits into the running process. Benchmarks show a large 3D game's cold first frame dropping from roughly 3 minutes to 11 seconds, with warm runs at 1.15 seconds and state-preserving live patches.

LATEST/Relax is a live compiler and JIT runtime for Rust from the Makepad team that runs Cargo packages directly from source, bypassing rustc, LLVM and the linker by compiling functions on first call and hot-patching edits into the running process. Benchmarks show a large 3D game's cold first frame dropping from roughly 3 minutes to 11 seconds, with warm runs at 1.15 seconds and state-preserving live patches.

Hourly heat curve

23 fully observed hours

Now

9.5

Peak

15.706:00

24h change

–

The line compares only sources observed throughout; gap hours are interpolated to keep the trend continuous.

Coverage timeline

Total 1 reports · Latest first

Hacker News AIT2Nov 12, 05:20·78 pts
Relax Debuts Rust JIT Compiler Cutting Build Times to Seconds
- Lazily compiles per function and optimizes hot paths at runtime, removing rustc/LLVM/linker entirely
- Large 3D game hits first frame in 11s cold and 1.15s warm; small apps 0.41s warm
- Live-patches function edits into a running process while preserving state; MIT licensed
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