CHchmike·Oct 22, 2026Submission
ZXC – Lossless Compression Built for Ultra-Fast Decode
2 points · Open discussionhellobertrand
zxc
C2025–2026
hellobertrand / zxc
zxc
Lossless compression C library built for ultra-fast decode. Faster than LZ4 (+30% to 125%+; best on ARM64), at a better ratio. Official Rust, Python, Node.js, Go and WASM bindings. Write-once/read-many, with optional seekable archives for O(1) random access.
2Distinct people
3Mentions
0Explicit recommenders
539GitHub stars
What to know before exploring
What it is
Lossless compression C library built for ultra-fast decode. Faster than LZ4 (+30% to 125%+; best on ARM64), at a better ratio. Official Rust, Python, Node.js, Go and WASM bindings. Write-once/read-many, with optional seekable archives for O(1) random access.
GitHub
Where it is used
No documented product use has been verified yet.
What people are saying
No recommendation phrase was found in the indexed comments.
No classified warning is attached to this page. Read the discussions before treating silence as approval.
Also in these discussions
No other repository is repeatedly linked in the same discussions.
This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 3:03:16 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by month3 dated mentions
Observed mentions: 2025-12-17 13:18:04 UTC to 2026-10-22 12:10:41 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| Dec 2025 | 2025-12-01 00:00:00 UTC | 2026-01-01 00:00:00 UTC | 2 | 2 | 0 |
| Jan 2026 | 2026-01-01 00:00:00 UTC | 2026-02-01 00:00:00 UTC | 0 | 0 | 0 |
| Feb 2026 | 2026-02-01 00:00:00 UTC | 2026-03-01 00:00:00 UTC | 0 | 0 | 0 |
| Mar 2026 | 2026-03-01 00:00:00 UTC | 2026-04-01 00:00:00 UTC | 0 | 0 | 0 |
| Apr 2026 | 2026-04-01 00:00:00 UTC | 2026-05-01 00:00:00 UTC | 0 | 0 | 0 |
| May 2026 | 2026-05-01 00:00:00 UTC | 2026-06-01 00:00:00 UTC | 0 | 0 | 0 |
| Jun 2026 | 2026-06-01 00:00:00 UTC | 2026-07-01 00:00:00 UTC | 0 | 0 | 0 |
| Jul 2026 | 2026-07-01 00:00:00 UTC | 2026-08-01 00:00:00 UTC | 0 | 0 | 0 |
| Aug 2026 | 2026-08-01 00:00:00 UTC | 2026-09-01 00:00:00 UTC | 0 | 0 | 0 |
| Sep 2026 | 2026-09-01 00:00:00 UTC | 2026-10-01 00:00:00 UTC | 0 | 0 | 0 |
| Oct 2026 | 2026-10-01 00:00:00 UTC | 2026-11-01 00:00:00 UTC | 1 | 1 | 0 |
What Hacker News says
3 sourcesShow HN: ZXC – Asymmetric, +40% decode vs. LZ4 on ARM (C, BSD-3, Fuzzed)
Hello HN, author here.
I built ZXC, a lossless compression library designed specifically for "Write Once, Read Many" scenarios (Game assets, Firmware, App bundles).
The Concept: Standard real-time codecs (LZ4, Snappy) are designed for symmetry. ZXC explores an asymmetric approach: it spends significantly more CPU cycles at compression time to generate a bitstream specifically structured for modern, wide-issue execution pipelines (maximizing Instruction Level Parallelism).
Performance (Verified via lzbench integration): ZXC was merged into the official lzbench repository monday.
ARM64 (Apple M2): 6,365 MB/s decoding (~40% faster than LZ4).
x86_64 (AMD EPYC 9554): At Level 5, ZXC achieves compression ratios comparable to zstd --fast while maintaining nearly 2x the decompression speed (3.8 GB/s vs 2.0 GB/s).
Implementation Details:
Written
Read the rest
in C99, zero internal allocation (caller provides buffers).
Designed for easy FFI (Go/Python/Rust bindings).
Validated via continuous fuzzing (ClusterFuzzLite) and static analysis.
PR for OSS-Fuzz integration is ready.
This is a v0.1.1 release. The bitstream format is stable but open to improvements based on feedback from the community.
https://github.com/hellobertrand/zxc
Show HN: ZXC – Asymmetric, +40% decode vs. LZ4 on ARM (C, BSD-3, Fuzzed)
28 points · Open discussion