Decompression of quality 10 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	2.770×
Rust brotli	0.581×
Burli	2.632×

mbrotli median speed / Burli: 1.051× (direct per-dataset ratios).

Decompression by dataset at source quality 10

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	0.1908	0.1901–0.1916	219.93	1.000×
mbrotli	0.02248	0.02164–0.02334	1,866.71	8.488×
Rust brotli	1.842	1.84–1.844	22.78	0.104×
Burli	0.03516	0.03497–0.03538	1,193.44	5.426×

text-1m

Alice text repeated cyclically to 1 MiB.

47,492 compressed → 1,048,576 restored bytes; compressed / original: 4.529%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	707.4	706.4–708.6	1,413.56	1.000×
mbrotli	315.1	314.8–315.3	3,173.84	2.245×
Rust brotli	909.5	908.9–910.1	1,099.52	0.778×
Burli	442	441.5–442.6	2,262.29	1.600×

binary-64k

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

1,063 compressed → 65,536 restored bytes; compressed / original: 1.622%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	37.85	37.81–37.88	1,651.39	1.000×
mbrotli	12.66	12.65–12.66	4,937.50	2.990×
Rust brotli	51.7	51.61–51.84	1,208.95	0.732×
Burli	13.84	13.83–13.86	4,514.47	2.734×

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	2.21	2.208–2.212	28,278.34	1.000×
mbrotli	0.8666	0.866–0.8673	72,121.07	2.550×
Rust brotli	35.45	35.42–35.49	1,763.08	0.062×
Burli	0.8738	0.8733–0.8743	71,527.36	2.529×

alice29

Vendored Alice in Wonderland text.

47,477 compressed → 152,089 restored bytes; compressed / original: 31.217%.

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	283.2	282.6–283.7	512.23	1.000×
mbrotli	281	280.7–281.2	516.17	1.008×
Rust brotli	378.1	377.8–378.5	383.57	0.749×
Burli	423	422.5–423.6	342.90	0.669×

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	40.11	40.08–40.15	24,929.99	1.000×
mbrotli	15.92	15.9–15.96	62,805.31	2.519×
Rust brotli	93.45	93.33–93.59	10,701.03	0.429×
Burli	15.89	15.88–15.91	62,921.46	2.524×

repeated-1m

1 MiB of repeated a bytes.

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

Decoder	Mean µs	95% mean interval µs	Decoded MiB/s	Speed / C
Google C	1,227	1,226–1,228	815.00	1.000×
mbrotli	8.955	8.948–8.963	111,664.27	137.011×
Rust brotli	1,264	1,262–1,267	791.11	0.971×
Burli	8.062	8.052–8.074	124,040.42	152.197×

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	0.1131	0.113–0.1133	—	1.000×
mbrotli	0.02025	0.01956–0.02096	—	5.588×
Rust brotli	1.711	1.709–1.712	—	0.066×
Burli	0.01543	0.01538–0.01551	—	7.333×

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