# MagicStack/uvloop

Ultra fast asyncio event loop.

Repository: https://github.com/MagicStack/uvloop
Canonical: https://ross.abutalabs.com/products/uvloop
Language: Cython
License: Apache-2.0
License Family: permissive
Topics: asyncio, async-await, async, high-performance, libuv, python, python-3, event-loop, networking, async-python
Last push: 2026-07-14T16:30:56+00:00

## Health v2 (maintenance only)
Score: 68/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 92, release rhythm 20, longevity 100
- inputs: {"age_days": 3951, "days_push": 50, "days_rel": 321, "gap_med": 183.0, "n_releases_24m": 3}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 11886, forks 612 (observed 2026-08-28T04:10:50.411912+00:00)

## What it is
uvloop is a fast, drop-in replacement for the built-in asyncio event loop, implemented in Cython on top of libuv. It makes asyncio-based Python networking 2-4x faster with a simple API (uvloop.run()).

## Use cases
- speed up asyncio networking in python
- drop-in replacement for asyncio event loop
- make python web server faster
- high performance async python
- replace default event loop with libuv-based one
- boost asyncio throughput for echo servers and proxies

## When to choose
- you run asyncio-based network services on Linux or macOS and want 2-4x better performance
- you want a drop-in event loop replacement with minimal code changes
- you build high-throughput servers, proxies, or clients on asyncio

## When to avoid
- you target Windows, where uvloop is not supported
- your workload is not I/O-bound and won't benefit from a faster event loop
- you need maximum portability with only the standard library

## Facets
- artifact type: library
- maturity: stable
- function: concurrency, networking, http-server
- domain: developer-tools, backend, performance, web-development
- platform: python, cross-platform
- tags: asyncio, event-loop, libuv, cython, high-performance, linux, macos

## Member repositories
- MagicStack/uvloop (main) score 68

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:50.411912+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:15:13.982715+00:00, confidence not recorded.
  - readme: https://github.com/MagicStack/uvloop (fetched 2026-08-28T04:10:50.411912+00:00, sha b7b66fd7282c)
- Data as of 2026-08-30T08:39:29.467469+00:00.