Decompression of quality 1 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	3.196×
Rust brotli	0.445×
Burli	3.129×

mbrotli median speed / Burli: 1.020× (direct per-dataset ratios).

Decompression by dataset at source quality 1

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	0.1489	0.1484–0.1495	281.85	1.000×
mbrotli	0.02249	0.02166–0.02334	1,865.55	6.619×
Rust brotli	1.844	1.842–1.846	22.75	0.081×
Burli	0.0347	0.03452–0.0349	1,209.37	4.291×

text-1m

Alice text repeated cyclically to 1 MiB.

138,777 compressed → 1,048,576 restored bytes; compressed / original: 13.235%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	795.2	793.7–796.3	1,257.58	1.000×
mbrotli	681.3	680.9–681.8	1,467.70	1.167×
Rust brotli	939.6	938.6–940.9	1,064.31	0.846×
Burli	747.8	747.4–748.2	1,337.29	1.063×

binary-64k

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

3,202 compressed → 65,536 restored bytes; compressed / original: 4.886%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	35.35	35.34–35.37	1,767.80	1.000×
mbrotli	9.27	9.261–9.281	6,741.99	3.814×
Rust brotli	77.69	77.61–77.78	804.46	0.455×
Burli	9.545	9.54–9.55	6,547.74	3.704×

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	2.177	2.176–2.179	28,703.96	1.000×
mbrotli	0.8443	0.8438–0.8449	74,023.09	2.579×
Rust brotli	35.78	35.72–35.84	1,746.90	0.061×
Burli	0.8527	0.852–0.8535	73,298.50	2.554×

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	39.99	39.94–40.05	25,006.64	1.000×
mbrotli	15.9	15.89–15.92	62,881.56	2.515×
Rust brotli	91.89	91.59–92.22	10,882.59	0.435×
Burli	15.97	15.94–16.02	62,598.41	2.503×

alice29

Vendored Alice in Wonderland text.

60,292 compressed → 152,089 restored bytes; compressed / original: 39.643%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	268.5	268.2–268.9	540.14	1.000×
mbrotli	281.7	281.4–282	514.89	0.953×
Rust brotli	399.7	399.5–399.9	362.86	0.672×
Burli	332.3	331.8–332.9	436.45	0.808×

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	0.1136	0.1135–0.1138	—	1.000×
mbrotli	0.02024	0.01954–0.02095	—	5.614×
Rust brotli	1.735	1.734–1.737	—	0.065×
Burli	0.01544	0.01539–0.01552	—	7.360×

repeated-1m

1 MiB of repeated a bytes.

190 compressed → 1,048,576 restored bytes; compressed / original: 0.018%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	373.3	372.8–373.8	2,678.88	1.000×
mbrotli	32.43	32.38–32.48	30,839.38	11.512×
Rust brotli	234	233.6–234.4	4,274.34	1.596×
Burli	18.81	18.79–18.83	53,166.03	19.846×

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