{
  "generated_at": "2026-09-05",
  "machine": "Apple M4 Max",
  "memory_gib": 64,
  "os": "macOS 26.6.2",
  "baseline_revision": "cf47294c12e84f9cfaf734bb9a4fc54d51e39c56",
  "candidate": "baseline plus uncommitted release-audit fixes",
  "public_corpora_ab": {
    "storage": "6 GiB APFS RAMDisk",
    "warmups": 1,
    "iterations": 3,
    "statistic": "median",
    "corpora": 7,
    "modes": ["ZIP", "AES-256"],
    "operations": ["create", "extract"],
    "combinations": 28,
    "integrity": "Every archive passed 7-Zip testing and every extraction matched its source fingerprint",
    "representative_results_ms": [
      {"corpus": "silesia", "mode": "ZIP", "create_baseline": 79.303, "create_candidate": 76.614, "extract_baseline": 50.071, "extract_candidate": 50.311},
      {"corpus": "silesia", "mode": "AES-256", "create_baseline": 80.871, "create_candidate": 81.937, "extract_baseline": 52.236, "extract_candidate": 52.197},
      {"corpus": "enwik8", "mode": "ZIP", "create_baseline": 40.371, "create_candidate": 42.582, "extract_baseline": 17.238, "extract_candidate": 17.434},
      {"corpus": "enwik8", "mode": "AES-256", "create_baseline": 47.324, "create_candidate": 47.030, "extract_baseline": 21.904, "extract_candidate": 21.452},
      {"corpus": "enwik9", "mode": "ZIP", "create_baseline": 338.782, "create_candidate": 341.960, "extract_baseline": 87.216, "extract_candidate": 87.155},
      {"corpus": "enwik9", "mode": "AES-256", "create_baseline": 347.963, "create_candidate": 348.840, "extract_baseline": 131.357, "extract_candidate": 131.182}
    ],
    "conclusion": "No consistent creation or extraction regression was reproduced"
  },
  "large_data_extraction": {
    "input": "58.43 GB stopped Parallels Windows 11 PVM ZIP",
    "archive_storage": "external WorkDisk SSD",
    "output_storage": "internal SSD",
    "startup": "excluded; resident process",
    "warmups": 0,
    "iterations": 1,
    "os_file_cache": "enabled",
    "restored_bytes": 58432123901,
    "restored_files": 21,
    "manifest_sha256": "62881144abdf503368a95fd161e01b596d8449bfe0f75bd1e1c8a5f4418dabdd",
    "results": [
      {"mode": "ZIP", "extract_seconds": 27.680482},
      {"mode": "AES-256", "extract_seconds": 24.010573499981547}
    ],
    "integrity": "Both restored trees matched the source SHA-256 manifest",
    "comparison_note": "The two one-shot values were measured sequentially with the OS file cache enabled and are not an encryption-overhead comparison",
    "same_archive_product_comparison": {
      "measurement": "One run per product and mode; archive on external WorkDisk SSD, restored tree on internal SSD; OS file cache enabled; hashing and cleanup excluded from timing",
      "standard_zip_bytes": 30154930215,
      "aes256_zip_bytes": 30158497911,
      "results": [
        {"product": "MetalArchiver", "zip_seconds": 27.680482, "aes256_seconds": 24.010573499981547},
        {"product": "BetterZip 6.0.5", "zip_seconds": 156.7594045830192, "aes256_seconds": 169.85065208398737},
        {"product": "7-Zip 26.02", "zip_seconds": 166.2099198329961, "aes256_seconds": 167.03107016699505},
        {"product": "Keka 1.6.7", "zip_seconds": 196.62089966700296, "aes256_seconds": 206.68485337498714},
        {"product": "Info-ZIP 3.0", "zip_seconds": 262.7110322919907, "aes256_seconds": null}
      ],
      "integrity": "Every completed extraction restored 21 files / 58,432,123,901 bytes and matched the same source SHA-256 manifest",
      "betterzip_note": "The reported BetterZip standard-ZIP value is a clean rerun; an earlier run interrupted by a free-space confirmation dialog was excluded",
      "aes256_note": "Info-ZIP 3.0 does not support WinZip AES-256 extraction"
    }
  }
}