Decompression of quality 9 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	2.553×
Rust brotli	0.569×
Burli	2.536×

mbrotli median speed / Burli: 0.986× (direct per-dataset ratios).

Decompression by dataset at source quality 9

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.

text-1m

Alice text repeated cyclically to 1 MiB.

50,608 compressed → 1,048,576 restored bytes; compressed / original: 4.826%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	652.6	652.2–653.1	1,532.26	1.000×
mbrotli	271.6	269.4–275.3	3,681.69	2.403×
Rust brotli	860.4	859.4–861.8	1,162.20	0.758×
Burli	373.8	373.3–374.2	2,675.39	1.746×

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	2.219	2.21–2.231	28,163.35	1.000×
mbrotli	0.858	0.8577–0.8583	72,842.62	2.586×
Rust brotli	35.43	35.4–35.46	1,764.11	0.063×
Burli	0.8649	0.8642–0.8656	72,266.70	2.566×

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	40.07	40.04–40.1	24,959.00	1.000×
mbrotli	15.9	15.9–15.91	62,877.12	2.519×
Rust brotli	92.24	92.16–92.34	10,841.68	0.434×
Burli	15.98	15.95–16.03	62,569.63	2.507×

binary-64k

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

1,349 compressed → 65,536 restored bytes; compressed / original: 2.058%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	34.45	34.43–34.48	1,814.24	1.000×
mbrotli	8.385	8.376–8.394	7,454.19	4.109×
Rust brotli	46.64	46.61–46.67	1,340.02	0.739×
Burli	8.109	8.096–8.121	7,707.05	4.248×

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	1,225–1,227	815.75	1.000×
mbrotli	8.465	8.459–8.473	118,128.32	144.809×
Rust brotli	1,269	1,265–1,274	788.31	0.966×
Burli	8.05	8.043–8.057	124,226.86	152.285×

alice29

Vendored Alice in Wonderland text.

51,054 compressed → 152,089 restored bytes; compressed / original: 33.569%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	200.5	200.4–200.7	723.34	1.000×
mbrotli	214.9	214.7–215.1	674.87	0.933×
Rust brotli	284.6	284.4–284.9	509.59	0.704×
Burli	287.9	287.6–288.1	503.87	0.697×

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	0.1129	0.1128–0.1131	—	1.000×
mbrotli	0.02025	0.01955–0.02097	—	5.575×
Rust brotli	1.709	1.708–1.71	—	0.066×
Burli	0.01545	0.0154–0.01553	—	7.309×

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	0.7998	0.7984–0.8013	52.47	1.000×
mbrotli	0.9037	0.9031–0.9043	46.43	0.885×
Rust brotli	3.511	3.507–3.515	11.95	0.228×
Burli	0.5856	0.5846–0.5865	71.65	1.366×

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