Decompression of quality 2 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	3.325×
Rust brotli	0.570×
Burli	3.362×

mbrotli median speed / Burli: 1.056× (direct per-dataset ratios).

Decompression by dataset at source quality 2

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	0.1846	0.1842–0.1851	227.34	1.000×
mbrotli	0.02252	0.02169–0.02337	1,863.59	8.197×
Rust brotli	1.845	1.842–1.849	22.74	0.100×
Burli	0.03513	0.03499–0.03529	1,194.48	5.254×

text-1m

Alice text repeated cyclically to 1 MiB.

57,403 compressed → 1,048,576 restored bytes; compressed / original: 5.474%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	659.7	659–660.4	1,515.89	1.000×
mbrotli	276.1	275.9–276.4	3,621.52	2.389×
Rust brotli	877.3	876.6–877.9	1,139.92	0.752×
Burli	308.2	307.8–308.7	3,244.40	2.140×

repeated-1m

1 MiB of repeated a bytes.

23 compressed → 1,048,576 restored bytes; compressed / original: 0.002%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	1,227	1,226–1,227	815.31	1.000×
mbrotli	10.52	10.52–10.53	95,016.53	116.541×
Rust brotli	1,258	1,257–1,259	794.77	0.975×
Burli	11.55	11.54–11.56	86,549.46	106.156×

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	2.201	2.2–2.202	28,391.28	1.000×
mbrotli	0.84	0.8393–0.8407	74,404.66	2.621×
Rust brotli	35.84	35.81–35.86	1,744.07	0.061×
Burli	0.852	0.8492–0.8574	73,355.28	2.584×

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	39.88	39.83–39.92	25,077.78	1.000×
mbrotli	15.86	15.83–15.88	63,067.51	2.515×
Rust brotli	83.82	83.69–83.97	11,930.95	0.476×
Burli	15.86	15.84–15.88	63,057.55	2.514×

binary-64k

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

2,673 compressed → 65,536 restored bytes; compressed / original: 4.079%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	34.73	34.7–34.77	1,799.57	1.000×
mbrotli	8.621	8.617–8.625	7,250.00	4.029×
Rust brotli	46.52	46.47–46.57	1,343.56	0.747×
Burli	8.388	8.382–8.395	7,450.75	4.140×

alice29

Vendored Alice in Wonderland text.

57,383 compressed → 152,089 restored bytes; compressed / original: 37.730%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	245.9	245.4–246.4	589.90	1.000×
mbrotli	254.7	254.4–255	569.48	0.965×
Rust brotli	370.1	369.8–370.4	391.94	0.664×
Burli	286.6	285.9–287.8	506.07	0.858×

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	0.1133	0.113–0.1135	—	1.000×
mbrotli	0.02025	0.01957–0.02095	—	5.593×
Rust brotli	1.728	1.726–1.729	—	0.066×
Burli	0.01551	0.01545–0.0156	—	7.302×

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