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Ultra fast asyncio event loop.

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uvloop is a fast, drop-in replacement of the built-in asyncio event loop. uvloop is implemented in Cython and uses libuv under the hood.

The project documentation can be found

. Please also check out the


uvloop makes asyncio 2-4x faster.

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The above chart shows the performance of an echo server with different message sizes. The sockets benchmark uses

methods; the streams benchmark uses asyncio high-level streams, created by the
function; and the protocol benchmark uses
with a simple echo protocol. Read more about uvloop in a
blog post 
_ about it.


uvloop requires Python 3.7 or greater and is available on PyPI. Use pip to install it::

$ pip install uvloop

Note that it is highly recommended to upgrade pip before installing uvloop with::

$ pip install -U pip

Using uvloop


before calling
or manually creating an asyncio event loop:

.. code:: python

import asyncio
import uvloop

async def main(): # Main entry-point. ...


Building From Source

To build uvloop, you'll need Python 3.7 or greater:

  1. Clone the repository:

.. code::

$ git clone --recursive [email protected]:MagicStack/uvloop.git
$ cd uvloop
  1. Create a virtual environment and activate it:

.. code::

$ python3.7 -m venv uvloop-dev
$ source uvloop-dev/bin/activate
  1. Install development dependencies:

.. code::

$ pip install -e .[dev]
  1. Build and run tests:

.. code::

$ make
$ make test


uvloop is dual-licensed under MIT and Apache 2.0 licenses.

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