uvloop

What it is

uvloop is an ultra-fast drop-in replacement for the built-in asyncio event loop. It leverages the high-performance libuv library to provide significant speed improvements over the default asyncio implementation, making it ideal for high-throughput and low-latency applications.

uvloop stands out as an ultra-fast, drop-in replacement for the default asyncio event loop, offering significant speed improvements without requiring substantial code changes.

When it fits — and when it doesn’t

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

1. 01

   Limited compatibility with certain asyncio features

   Some advanced asyncio features may not be fully supported or behave differently compared to the default event loop.

2. 02

   Dependency on libuv can introduce platform-specific issues

   libuv's performance and behavior can vary across different operating systems, leading to potential instability or reduced performance on certain platforms.

3. 03

   Requires Python 3.7+ which may not be feasible for all projects

   Projects still using older versions of Python cannot benefit from uvloop's performance improvements without upgrading their environment.

What it does well

• Significantly faster than the default asyncio event loop.

• Drop-in replacement for asyncio, minimal code changes required.

• Built on top of libuv for high performance.

• Supports all features of the standard asyncio library.

Pricing

Free tier

YesOpen source — free to use

Paid from

$0

Model

Flat rate

Enterprise plan

No

Pricing not independently confirmed — check the vendor’s page.