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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 here <>. Please also check out the wiki <>.


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 loop.sock_recv() and loop.sock_sendall() methods; the streams benchmark uses asyncio high-level streams, created by the asyncio.start_server() function; and the protocol benchmark uses loop.create_server() 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

Call uvloop.install() 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

  2. Create a virtual environment and activate it:

    .. code::

    $ python3.7 -m venv uvloop-dev $ source uvloop-dev/bin/activate

  3. Install development dependencies:

    .. code::

    $ pip install -e .[dev]

  4. Build and run tests:

    .. code::

    $ make $ make test


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

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