aiohttp-fast-zlib
Use the fastest installed zlib compatible library with aiohttp
Decision gist · record as of 2026-08-14
Yes, if you use aiohttp and compression is a known bottleneck in your workload. The package is low-friction to install and maintain, has no known vulnerabilities, and offers a straightforward performance win. Pre-Alpha status means you should test it in a non-critical environment first and monitor for API changes in future releases.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires either isal or zlib-ng to be installed as an optional extra; without one, the package will not provide a performance benefit.
- Low friction: pure Python wheel with a single runtime dependency (aiohttp).
- Actively maintained with recent commits.
License · maintenance · safety
Apache-2.0 (permissive) — Apache-2.0 permissive license allows commercial and private use with minimal restrictions; you must retain license notices in distributions.
last release 2025-06-07 (433 days) · last repo commit 2026-08-10 · 4 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 1,811,781 downloads/mo, #3,529 on PyPI
Alternatives
Verify before relying
pip install aiohttp-fast-zlib[isal]
import aiohttp_fast_zlib
aiohttp_fast_zlib.enable()- Whether isal or zlib-ng must be pre-installed or are automatically pulled in by the extras.
- Specific performance gains (percentage improvement) over standard aiohttp compression.
- Compatibility with all aiohttp versions or specific version constraints.
What it is and what it does
aiohttp-fast-zlib is a thin wrapper that swaps aiohttp's compression layer to use faster zlib-compatible libraries. Compression is a known bottleneck in aiohttp, especially for WebSocket connections that compress frequently; this package patches aiohttp to use isal or zlib-ng instead of the standard library's zlib, both of which are drop-in replacements with better performance. You call a single enable() function at startup, and all subsequent aiohttp compression operations use the faster library.
The package is in Pre-Alpha development, meaning the API and behavior may change. It has a single runtime dependency on aiohttp and requires Python 3.9 or later. Installation is straightforward, but you must also install one of the optional compression libraries (isal or zlib-ng) to see any benefit.
Use it for
- Speed up WebSocket communication in aiohttp applications by reducing compression CPU overhead.
- Improve throughput for HTTP APIs that heavily compress responses (JSON, HTML, etc.).
- Reduce latency in real-time aiohttp services where zlib compression is a measurable bottleneck.
- Optimize resource usage on servers handling many concurrent aiohttp connections.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you use aiohttp and compression is a known bottleneck in your workload.
The package is low-friction to install and maintain, has no known vulnerabilities, and offers a straightforward performance win. Pre-Alpha status means you should test it in a non-critical environment first and monitor for API changes in future releases.
Install
aiohttp-fast-zlib on PyPI
Before you install
Low friction: pure Python wheel with a single runtime dependency (aiohttp). Actively maintained with recent commits. Pre-Alpha status signals the package is still stabilizing, so expect potential API changes.
Requires either isal or zlib-ng to be installed as an optional extra; without one, the package will not provide a performance benefit.
License in practice
Apache-2.0 permissive license allows commercial and private use with minimal restrictions; you must retain license notices in distributions.
Quickstart
pip install aiohttp-fast-zlib[isal]
import aiohttp_fast_zlib
aiohttp_fast_zlib.enable()Verify before relying
- Whether isal or zlib-ng must be pre-installed or are automatically pulled in by the extras.
- Specific performance gains (percentage improvement) over standard aiohttp compression.
- Compatibility with all aiohttp versions or specific version constraints.
Package facts
| License | Apache-2.0 permissive |
| Python support | Supports the current Python release >=3.9 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packageaiohttp |
| Maintenance | Actively maintained 433 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 1,811,781 / month, #3,529 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 2 - Pre-AlphaIntended Audience :: DevelopersLicense :: OSI Approved :: Apache Software LicenseNatural Language :: EnglishOperating System :: OS IndependentProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.9Topic :: Software Development :: Libraries |
Evidence: aiohttp_fast_zlib-0.3.0-py3-none-any.whl
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See also aiohttp-fast-url-dispatcher · aiohttp-zlib-ng · zlib-ng · isal · aiofastnet · aioshelly · aiooui · aiohttp-wsgi · blosc · aiohttp