Decompression of quality 4 streams

Recorded run: dec-2026-10-30-amd (2026-10-30). CSV · Environment · Methodology and limits.

Quality belongs to the C encoder that prepared the input; decoders have no quality setting. All four decode the same bytes. Burli is included at every source quality; SIMD Brotli re-exports Rust brotli’s decoder and is omitted.

Median speed across 8 datasets

Median of per-dataset C mean time / decoder mean time ratios, with equal weight. Higher is faster; 1× matches C. No confidence interval is inferred for this across-dataset median.

Decoder	Median speed / C
Google C	1.000×
mbrotli	3.461×
Rust brotli	0.574×
Burli	3.407×

mbrotli median speed / Burli: 1.003× (direct per-dataset ratios).

Decompression by dataset at source quality 4

Datasets are ranked by mbrotli speed relative to the fastest peer, highest first. Throughput counts restored bytes; empty input has latency only. Whiskers and intervals describe sampling uncertainty, not all host variation. Cold APIs include allocation and disposal. C knows the output capacity; Rust brotli includes its 4 KiB I/O adapter.

tiny-text

44-byte quick-brown-fox sentence.

48 compressed → 44 restored bytes; compressed / original: 109.091%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	0.1689	0.1684–0.1695	248.43	1.000×
mbrotli	0.02235	0.02146–0.0233	1,877.77	7.558×
Rust brotli	1.813	1.812–1.815	23.14	0.093×
Burli	0.03519	0.03507–0.03533	1,192.56	4.800×

text-1m

Alice text repeated cyclically to 1 MiB.

55,915 compressed → 1,048,576 restored bytes; compressed / original: 5.332%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	655.2	640.5–670.3	1,526.33	1.000×
mbrotli	239.6	239.4–239.8	4,173.38	2.734×
Rust brotli	827.7	827.3–828.1	1,208.19	0.792×
Burli	291.7	291.4–292	3,428.35	2.246×

random-64k

64 KiB prefix of the deterministic pseudorandom corpus.

65,540 compressed → 65,536 restored bytes; compressed / original: 100.006%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	2.186	2.185–2.187	28,590.91	1.000×
mbrotli	0.8425	0.8419–0.8432	74,185.89	2.595×
Rust brotli	35.78	35.76–35.8	1,746.73	0.061×
Burli	0.8537	0.8533–0.8541	73,211.67	2.561×

random-1m

1 MiB of deterministic xorshift64 pseudorandom bytes.

1,048,581 compressed → 1,048,576 restored bytes; compressed / original: 100.000%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	40.18	40.12–40.23	24,890.59	1.000×
mbrotli	15.88	15.85–15.9	62,986.65	2.531×
Rust brotli	90.98	90.92–91.05	10,991.00	0.442×
Burli	15.75	15.73–15.77	63,501.84	2.551×

binary-64k

64 KiB of structured binary bytes: ((i / 16) XOR i) modulo 256.

2,554 compressed → 65,536 restored bytes; compressed / original: 3.897%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	34.66	34.64–34.68	1,803.36	1.000×
mbrotli	8.274	8.265–8.284	7,553.65	4.189×
Rust brotli	46.7	46.66–46.74	1,338.46	0.742×
Burli	8.15	8.145–8.154	7,669.11	4.253×

repeated-1m

1 MiB of repeated a bytes.

13 compressed → 1,048,576 restored bytes; compressed / original: 0.001%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	1,226	1,225–1,228	815.47	1.000×
mbrotli	8.507	8.504–8.51	117,554.83	144.156×
Rust brotli	1,253	1,253–1,254	797.77	0.978×
Burli	8.189	8.178–8.201	122,112.05	149.744×

alice29

Vendored Alice in Wonderland text.

55,504 compressed → 152,089 restored bytes; compressed / original: 36.494%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	220.1	219.6–220.7	658.93	1.000×
mbrotli	234.5	234.3–234.7	618.51	0.939×
Rust brotli	312	311.8–312.2	464.88	0.706×
Burli	291.8	291.4–292.2	497.14	0.754×

empty

Empty input; measures API overhead.

1 compressed → 0 restored bytes; compressed / original: undefined.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	0.1098	0.1097–0.1099	—	1.000×
mbrotli	0.02026	0.01958–0.02096	—	5.419×
Rust brotli	1.728	1.727–1.73	—	0.064×
Burli	0.01545	0.0154–0.01555	—	7.105×

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