uvloop
Ultra fast asyncio event loop for Python.
Pricing
Free tier
Flat rate
Adoption
→StableLicense
Open Source
Data freshness
Aging · Jun 8, 2026Overview
What is uvloop?
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.
Key differentiator
“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.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
Some advanced asyncio features may not be fully supported or behave differently compared to the default event loop.
libuv's performance and behavior can vary across different operating systems, leading to potential instability or reduced performance on certain platforms.
Projects still using older versions of Python cannot benefit from uvloop's performance improvements without upgrading their environment.
Fit analysis
Who is it for?
✓ Best for
Developers building high-throughput, low-latency Python applications using asyncio.
Teams working on real-time systems where performance is critical.
Projects requiring significant improvements in event loop speed over the default asyncio implementation.
✕ Not a fit for
Applications that do not require high-performance event loops and can function well with the standard asyncio library.
Scenarios where the overhead of integrating a new event loop outweighs potential performance gains.
Cost structure
Pricing
Free Tier
Available
Open source — free to use
Starts at
$0
Model
Flat rate
Enterprise
None
Performance benchmarks
How Fast Is It?
Ecosystem
Relationships
Alternatives
Works well with
Next step
Get Started with uvloop
Step-by-step setup guide with code examples and common gotchas.