🚧 Heavy Work In Progress. Not ready for production. Expect breaking changes.
| The "Python Tax" | The Velo Fix |
|---|---|
| Cold starts take 500ms+ | 60x faster with Zygote pre-warming |
| Model loading is slow | Fork pre-loaded models in <20ms |
| Tests block your flow | 40x faster pytest runs |
| Deploys are complex | Single command: velo serve main:app |
╔════════════════════════════════════════════════════════════╗
║ FastAPI Hello World (Startup) ║
╠════════════════════════════════════════════════════════════╣
║ CPython ██████████████████████████░░░░░ 514ms ║
║ Velo (Instant) ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ 8.6ms ⚡║
╚════════════════════════════════════════════════════════════╝
🚀 59.7x faster than CPython
"My Lambda function takes 10 seconds to cold start because of PyTorch."
Velo pre-loads your model into a Zygote. Every request forks from that warm state in <20ms. Memory is shared via Copy-on-Write.
"I spend more time waiting for tests than writing code."
Velo's pytest --velo plugin accelerates your test suite by 40x. Combined with Vibe Mode, you get instant feedback on every save.
→ Read the Developer Workflow Guide
git clone https://github.com/velo-sh/velo.git && cd velo
cargo build --release
./target/release/velo run examples/hello.py# Run any Python script, 60x faster
velo run script.py
# Serve a web app (FastAPI, Django, Flask)
velo serve main:app --workers 4
# Accelerate your tests
pytest --velo
# Vibe Mode: instant hot-reload
velo run --vibe app.py- Python: 3.11, 3.12, 3.13+ (single binary)
- Frameworks: FastAPI, Django, Flask, Celery
- Packages: 100% of PyPI Top 100 verified ✅
| Guide | Description |
|---|---|
| AI Inference | Deploy AI models with <20ms cold start |
| Developer Workflow | 40x faster tests, instant hot-reload |
| Compatibility Charter | Our commitment to zero breaking changes |
- Zero Python Patch: We never modify CPython. Full compatibility guaranteed.
- SLO-Backed Performance: Fork latency P99 < 100ms, contractually.
- Security Hardened: Landlock isolation, process sandboxing, supply-chain audited.
Velo stands on the shoulders of giants. We take pride in our deep integrations with the best tools in the Python ecosystem:
- uv: Velo's first-class dependency engine. We leverage
uvfor lightning-fast environment synchronization and reliable lockfile detection. - Granian: Our high-performance HTTP server backend. Velo integrates
Granianto provide the raw power behindvelo serve.
Apache-2.0