BENCHMARKS

Every number on this page comes from pnpm benchmark <key> and is committed to the repo as JSON in benchmarks/results. Each chart names its machine, toolchain and commit, so you can reproduce it.

PIXEL BY PIXEL

Direct pixel comparisons in JavaScript, WebAssembly, the native binary and the Python bindings.

JavaScript2 charts

JavaScript (`@blazediff/core` vs `pixelmatch`) (image IO excluded)

TOTAL TIME · 34 FIXTURES · MEAN OF 50 RUNS · IO EXCLUDED

BlazeDiffOther librariesLower is better

Apple M1 Max · darwin/arm64 · Node v22.14.0 · rustc 1.97.1 (8bab26f4f 2026-07-14) · 2026-10-22 · 234b300-dirty · pnpm benchmark core

Per-fixture results (34)

Fixture	Pixelmatch	BlazeDiff	BlazeDiff vs Pixelmatch
4k/1	325ms	95.14ms	3.42x
4k/1 (identical)	23.07ms	2.86ms	8.07x
4k/2	326ms	104ms	3.12x
4k/2 (identical)	23.41ms	3.48ms	6.72x
4k/3	411ms	126ms	3.26x
4k/3 (identical)	34.26ms	4.31ms	7.94x
blazediff/1	1.24ms	0.69ms	1.79x
blazediff/1 (identical)	0.49ms	0.06ms	8.71x
blazediff/2	1.79ms	0.94ms	1.90x
blazediff/2 (identical)	0.40ms	0.06ms	6.40x
blazediff/3	10.52ms	7.51ms	1.40x
blazediff/3 (identical)	1.86ms	0.23ms	8.22x
blazediff/4	13.96ms	7.36ms	1.90x
blazediff/4 (identical)	4.39ms	0.65ms	6.76x
page/1	161ms	94.51ms	1.70x
page/1 (identical)	69.46ms	10.40ms	6.68x
page/2	524ms	152ms	3.44x
page/2 (identical)	48.55ms	6.87ms	7.07x
pixelmatch/1	0.58ms	0.31ms	1.91x
pixelmatch/1 (identical)	0.27ms	0.02ms	16.17x
pixelmatch/2	2.19ms	1.61ms	1.36x
pixelmatch/2 (identical)	0.07ms	0.01ms	8.90x
pixelmatch/3	0.37ms	0.23ms	1.63x
pixelmatch/3 (identical)	0.15ms	0.02ms	9.50x
pixelmatch/4	4.24ms	2.88ms	1.47x
pixelmatch/4 (identical)	0.21ms	0.03ms	8.12x
pixelmatch/5	0.18ms	0.12ms	1.58x
pixelmatch/5 (identical)	0.07ms	0.01ms	8.01x
pixelmatch/6	0.80ms	0.57ms	1.40x
pixelmatch/6 (identical)	0.07ms	0.01ms	7.88x
pixelmatch/7	1.26ms	0.81ms	1.55x
pixelmatch/7 (identical)	0.28ms	0.03ms	9.40x
same/1	3.16ms	0.24ms	13.26x
same/1 (identical)	3.40ms	0.24ms	14.17x
TOTAL	2.00s	625ms	3.19x

JavaScript with output buffer (`@blazediff/core` vs `pixelmatch`) (image IO excluded)

TOTAL TIME · 34 FIXTURES · MEAN OF 50 RUNS · IO EXCLUDED

BlazeDiffOther librariesLower is better

Apple M1 Max · darwin/arm64 · Node v22.14.0 · rustc 1.97.1 (8bab26f4f 2026-07-14) · 2026-10-22 · 234b300-dirty · pnpm benchmark core

Per-fixture results (34)

Fixture	Pixelmatch	BlazeDiff	BlazeDiff vs Pixelmatch
4k/1	415ms	142ms	2.92x
4k/1 (identical)	76.37ms	48.86ms	1.56x
4k/2	382ms	162ms	2.37x
4k/2 (identical)	84.56ms	58.27ms	1.45x
4k/3	493ms	190ms	2.59x
4k/3 (identical)	99.22ms	66.46ms	1.49x
blazediff/1	2.63ms	1.97ms	1.33x
blazediff/1 (identical)	1.74ms	1.26ms	1.39x
blazediff/2	2.96ms	1.95ms	1.52x
blazediff/2 (identical)	1.42ms	0.98ms	1.46x
blazediff/3	19.56ms	12.32ms	1.59x
blazediff/3 (identical)	6.69ms	4.48ms	1.49x
blazediff/4	25.41ms	18.26ms	1.39x
blazediff/4 (identical)	15.22ms	10.37ms	1.47x
page/1	351ms	267ms	1.31x
page/1 (identical)	242ms	163ms	1.49x
page/2	642ms	270ms	2.38x
page/2 (identical)	189ms	114ms	1.65x
pixelmatch/1	1.64ms	0.68ms	2.42x
pixelmatch/1 (identical)	0.72ms	0.35ms	2.05x
pixelmatch/2	2.36ms	1.95ms	1.21x
pixelmatch/2 (identical)	0.28ms	0.18ms	1.57x
pixelmatch/3	0.79ms	0.63ms	1.26x
pixelmatch/3 (identical)	0.52ms	0.35ms	1.49x
pixelmatch/4	4.73ms	3.43ms	1.38x
pixelmatch/4 (identical)	0.72ms	0.49ms	1.48x
pixelmatch/5	0.39ms	0.32ms	1.25x
pixelmatch/5 (identical)	0.27ms	0.18ms	1.48x
pixelmatch/6	1.01ms	0.84ms	1.21x
pixelmatch/6 (identical)	0.27ms	0.18ms	1.50x
pixelmatch/7	2.02ms	1.54ms	1.31x
pixelmatch/7 (identical)	1.01ms	0.67ms	1.50x
same/1	7.27ms	4.72ms	1.54x
same/1 (identical)	7.26ms	4.79ms	1.52x
TOTAL	3.08s	1.55s	1.98x

Native2 charts

WebAssembly (`@blazediff/core-wasm` vs `pixelmatch`) (image IO excluded)

TOTAL TIME · 34 FIXTURES · MEAN OF 25 RUNS · IO EXCLUDED

BlazeDiffOther librariesLower is better

Apple M1 Max · darwin/arm64 · Node v22.14.0 · rustc 1.97.1 (8bab26f4f 2026-07-14) · 2026-10-22 · 234b300-dirty · pnpm benchmark core-wasm

Per-fixture results (34)

Fixture	Pixelmatch	BlazeDiff (core-wasm)	BlazeDiff (core-wasm) vs Pixelmatch
4k/1	325ms	35.95ms	9.04x
4k/1 (identical)	20.79ms	16.16ms	1.29x
4k/2	321ms	66.39ms	4.83x
4k/2 (identical)	23.47ms	24.79ms	0.95x
4k/3	406ms	44.62ms	9.09x
4k/3 (identical)	28.54ms	20.69ms	1.38x
blazediff/1	1.26ms	0.27ms	4.74x
blazediff/1 (identical)	0.50ms	0.22ms	2.24x
blazediff/2	1.66ms	0.50ms	3.35x
blazediff/2 (identical)	0.42ms	0.17ms	2.39x
blazediff/3	10.44ms	6.25ms	1.67x
blazediff/3 (identical)	1.91ms	0.94ms	2.04x
blazediff/4	12.32ms	4.38ms	2.81x
blazediff/4 (identical)	4.53ms	2.43ms	1.87x
page/1	151ms	50.48ms	2.99x
page/1 (identical)	67.52ms	63.82ms	1.06x
page/2	519ms	75.10ms	6.91x
page/2 (identical)	49.46ms	37.86ms	1.31x
pixelmatch/1	0.58ms	0.11ms	5.09x
pixelmatch/1 (identical)	0.15ms	0.07ms	2.14x
pixelmatch/2	2.28ms	1.47ms	1.55x
pixelmatch/2 (identical)	0.08ms	0.03ms	2.43x
pixelmatch/3	0.38ms	0.12ms	3.25x
pixelmatch/3 (identical)	0.15ms	0.07ms	2.15x
pixelmatch/4	4.07ms	2.96ms	1.38x
pixelmatch/4 (identical)	0.21ms	0.10ms	2.05x
pixelmatch/5	0.19ms	0.06ms	3.07x
pixelmatch/5 (identical)	0.08ms	0.03ms	2.35x
pixelmatch/6	0.75ms	0.65ms	1.14x
pixelmatch/6 (identical)	0.08ms	0.03ms	2.37x
pixelmatch/7	1.23ms	0.60ms	2.07x
pixelmatch/7 (identical)	0.29ms	0.13ms	2.27x
same/1	2.15ms	1.16ms	1.85x
same/1 (identical)	1.98ms	0.96ms	2.07x
TOTAL	1.96s	460ms	4.26x

JavaScript Native Binary (`@blazediff/core-native` vs `odiff` vs `honeydiff`) (image IO included)

TOTAL TIME · 34 FIXTURES · MEAN OF 25 RUNS · IO INCLUDED

BlazeDiffOther librariesLower is better

Both libraries run at their defaults with antialiasing on and write a diff PNG. honeydiff thresholds on CIEDE2000 ΔE and BlazeDiff on YIQ, so this compares speed, not identical output.

Apple M1 Max · darwin/arm64 · Node v22.14.0 · rustc 1.97.1 (8bab26f4f 2026-07-14) · 2026-10-22 · 234b300-dirty · pnpm benchmark core-native

Apple M1 Max · darwin/arm64 · Node v22.14.0 · rustc 1.97.1 (8bab26f4f 2026-07-14) · 2026-10-22 · 234b300-dirty · pnpm benchmark honeydiff

Per-fixture results (34)

Fixture	ODiff	honeydiff	BlazeDiff	BlazeDiff Next	honeydiff vs ODiff	BlazeDiff vs ODiff	BlazeDiff Next vs ODiff
4k/1	1.30s	1.60s	316ms	233ms	0.81x	4.09x	5.55x
4k/1 (identical)	271ms	548ms	187ms	150ms	0.49x	1.45x	1.81x
4k/2	1.56s	1.43s	393ms	313ms	1.10x	3.97x	4.99x
4k/2 (identical)	338ms	652ms	224ms	167ms	0.52x	1.50x	2.02x
4k/3	1.89s	1.30s	393ms	300ms	1.46x	4.80x	6.30x
4k/3 (identical)	389ms	731ms	231ms	175ms	0.53x	1.69x	2.23x
blazediff/1	3.92ms	4.29ms	3.08ms	2.97ms	0.91x	1.27x	1.32x
blazediff/1 (identical)	1.53ms	4.43ms	0.87ms	0.85ms	0.35x	1.75x	1.81x
blazediff/2	4.29ms	4.17ms	3.57ms	2.06ms	1.03x	1.20x	2.08x
blazediff/2 (identical)	1.39ms	3.90ms	1.06ms	0.76ms	0.36x	1.31x	1.83x
blazediff/3	48.95ms	45.38ms	32.15ms	20.54ms	1.08x	1.52x	2.38x
blazediff/3 (identical)	18.79ms	40.41ms	14.28ms	11.42ms	0.46x	1.32x	1.64x
blazediff/4	23.79ms	30.89ms	26.31ms	23.92ms	0.77x	0.90x	0.99x
blazediff/4 (identical)	10.93ms	24.95ms	4.61ms	3.80ms	0.44x	2.37x	2.87x
page/1	998ms	764ms	675ms	548ms	1.31x	1.48x	1.82x
page/1 (identical)	542ms	780ms	249ms	166ms	0.69x	2.18x	3.27x
page/2	607ms	1.54s	415ms	280ms	0.39x	1.46x	2.17x
page/2 (identical)	124ms	400ms	42.18ms	32.85ms	0.31x	2.93x	3.76x
pixelmatch/1	3.84ms	5.05ms	2.23ms	1.21ms	0.76x	1.72x	3.16x
pixelmatch/1 (identical)	1.73ms	2.92ms	1.05ms	0.84ms	0.59x	1.64x	2.05x
pixelmatch/2	3.54ms	4.85ms	1.79ms	1.72ms	0.73x	1.98x	2.06x
pixelmatch/2 (identical)	0.53ms	1.70ms	0.47ms	0.22ms	0.31x	1.12x	2.40x
pixelmatch/3	3.25ms	2.69ms	1.42ms	1.30ms	1.21x	2.28x	2.49x
pixelmatch/3 (identical)	1.67ms	2.53ms	0.87ms	0.63ms	0.66x	1.91x	2.65x
pixelmatch/4	9.61ms	12.25ms	4.85ms	4.72ms	0.78x	1.98x	2.04x
pixelmatch/4 (identical)	2.64ms	5.94ms	2.16ms	1.25ms	0.44x	1.22x	2.11x
pixelmatch/5	0.79ms	1.77ms	0.97ms	0.70ms	0.45x	0.82x	1.14x
pixelmatch/5 (identical)	0.85ms	1.55ms	0.56ms	0.41ms	0.55x	1.52x	2.08x
pixelmatch/6	8.90ms	5.24ms	2.08ms	2.39ms	1.70x	4.29x	3.73x
pixelmatch/6 (identical)	0.98ms	1.91ms	0.83ms	0.57ms	0.51x	1.18x	1.71x
pixelmatch/7	3.60ms	3.74ms	2.64ms	1.80ms	0.96x	1.36x	2.00x
pixelmatch/7 (identical)	0.72ms	3.46ms	0.63ms	0.31ms	0.21x	1.15x	2.36x
same/1	5.04ms	16.00ms	3.09ms	2.95ms	0.32x	1.63x	1.71x
same/1 (identical)	5.50ms	16.74ms	3.20ms	2.58ms	0.33x	1.72x	2.13x
TOTAL	8.18s	9.99s	3.24s	2.45s	0.82x	2.52x	3.33x

Python1 chart

Python Bindings (`blazediff` vs `pixelmatch` vs `opencv-python`) (image IO included)

TOTAL TIME · 34 FIXTURES · MEAN OF 10 OR 25 RUNS · IO INCLUDED

BlazeDiffOther librariesLower is better

Apple M1 Max · darwin/arm64 · Node v22.14.0 · rustc 1.97.1 (8bab26f4f 2026-07-14) · Python 3.11.14 · 2026-10-22 · 234b300-dirty · pnpm benchmark python-pixelmatch

Apple M1 Max · darwin/arm64 · Node v22.14.0 · rustc 1.97.1 (8bab26f4f 2026-07-14) · Python 3.11.14 · 2026-10-22 · 234b300-dirty · pnpm benchmark python-opencv

Per-fixture results (34)

Fixture	pixelmatch (pypi)	OpenCV absdiff	BlazeDiff	OpenCV absdiff vs pixelmatch (pypi)	BlazeDiff vs pixelmatch (pypi)
4k/1	20.20s	617ms	216ms	32.77x	93.42x
4k/1 (identical)	596ms	782ms	192ms	0.76x	3.10x
4k/2	23.28s	710ms	265ms	32.80x	87.76x
4k/2 (identical)	734ms	695ms	232ms	1.06x	3.16x
4k/3	26.30s	820ms	273ms	32.05x	96.42x
4k/3 (identical)	792ms	790ms	241ms	1.00x	3.29x
blazediff/1	261ms	4.94ms	0.86ms	52.91x	305.75x
blazediff/1 (identical)	4.18ms	4.50ms	0.99ms	0.93x	4.22x
blazediff/2	271ms	4.14ms	1.00ms	65.51x	269.88x
blazediff/2 (identical)	3.81ms	4.01ms	0.95ms	0.95x	4.01x
blazediff/3	1.50s	44.59ms	14.68ms	33.71x	102.40x
blazediff/3 (identical)	46.32ms	44.49ms	14.38ms	1.04x	3.22x
blazediff/4	2.48s	30.53ms	5.17ms	81.15x	478.82x
blazediff/4 (identical)	28.76ms	30.23ms	4.94ms	0.95x	5.82x
page/1	40.25s	1.06s	268ms	37.86x	150.13x
page/1 (identical)	872ms	1.21s	268ms	0.72x	3.25x
page/2	42.52s	306ms	97.96ms	139.17x	434.01x
page/2 (identical)	179ms	288ms	55.83ms	0.62x	3.20x
pixelmatch/1	88.66ms	3.46ms	1.15ms	25.59x	77.15x
pixelmatch/1 (identical)	2.86ms	4.40ms	1.09ms	0.65x	2.62x
pixelmatch/2	179ms	1.16ms	0.69ms	154.60x	258.08x
pixelmatch/2 (identical)	0.89ms	1.07ms	0.45ms	0.83x	1.99x
pixelmatch/3	86.57ms	3.40ms	0.94ms	25.43x	91.86x
pixelmatch/3 (identical)	2.25ms	3.96ms	0.83ms	0.57x	2.71x
pixelmatch/4	377ms	7.76ms	2.66ms	48.60x	141.55x
pixelmatch/4 (identical)	5.69ms	6.00ms	1.98ms	0.95x	2.87x
pixelmatch/5	44.24ms	1.84ms	0.56ms	24.04x	79.23x
pixelmatch/5 (identical)	1.13ms	1.89ms	0.60ms	0.60x	1.89x
pixelmatch/6	109ms	2.64ms	1.27ms	41.10x	85.25x
pixelmatch/6 (identical)	1.59ms	4.48ms	0.79ms	0.35x	2.00x
pixelmatch/7	193ms	1.89ms	0.72ms	102.29x	267.35x
pixelmatch/7 (identical)	1.53ms	2.06ms	0.63ms	0.74x	2.44x
same/1	23.42ms	18.29ms	3.52ms	1.28x	6.65x
same/1 (identical)	25.54ms	19.38ms	3.14ms	1.32x	8.13x
TOTAL	161.46s	7.53s	2.17s	21.45x	74.30x

STRUCTURAL

SSIM and its variants against ssim.js and the Rust dssim.

JavaScript and native2 charts

Fast Original ( `@blazediff/ssim` using `ssim` vs `ssim.js` using `fast` algorithm) (image IO excluded)

TOTAL TIME · 22 FIXTURES · MEAN OF 25 RUNS · IO EXCLUDED

BlazeDiffOther librariesLower is better

Apple M1 Max · darwin/arm64 · Node v22.14.0 · rustc 1.97.1 (8bab26f4f 2026-07-14) · 2026-10-22 · 234b300-dirty · pnpm benchmark ssim

Per-fixture results (22)

Fixture	ssim.js	BlazeDiff	BlazeDiff (ssim-native)	BlazeDiff vs ssim.js	BlazeDiff (ssim-native) vs ssim.js
blazediff/1	92.94ms	65.98ms	5.36ms	1.41x	17.33x
blazediff/1 (identical)	99.29ms	65.49ms	7.92ms	1.52x	12.54x
blazediff/2	39.45ms	23.49ms	1.55ms	1.68x	25.42x
blazediff/2 (identical)	36.44ms	24.04ms	1.60ms	1.52x	22.77x
blazediff/3	112ms	98.71ms	5.47ms	1.13x	20.44x
blazediff/3 (identical)	106ms	100ms	5.03ms	1.06x	21.14x
blazediff/4	259ms	226ms	12.26ms	1.15x	21.10x
blazediff/4 (identical)	268ms	229ms	11.99ms	1.17x	22.31x
pixelmatch/1	28.25ms	20.13ms	1.63ms	1.40x	17.29x
pixelmatch/1 (identical)	30.38ms	19.79ms	1.57ms	1.54x	19.34x
pixelmatch/2	13.92ms	10.90ms	0.87ms	1.28x	16.05x
pixelmatch/2 (identical)	14.40ms	9.96ms	0.76ms	1.45x	19.06x
pixelmatch/3	30.00ms	19.92ms	1.60ms	1.51x	18.74x
pixelmatch/3 (identical)	28.97ms	19.86ms	1.63ms	1.46x	17.73x
pixelmatch/4	19.65ms	11.76ms	0.79ms	1.67x	24.77x
pixelmatch/4 (identical)	20.60ms	11.88ms	0.81ms	1.73x	25.50x
pixelmatch/5	14.34ms	10.15ms	0.76ms	1.41x	18.93x
pixelmatch/5 (identical)	15.07ms	9.94ms	0.78ms	1.52x	19.33x
pixelmatch/6	14.38ms	9.98ms	0.76ms	1.44x	18.95x
pixelmatch/6 (identical)	13.79ms	10.70ms	0.77ms	1.29x	17.89x
pixelmatch/7	27.20ms	16.64ms	1.32ms	1.63x	20.65x
pixelmatch/7 (identical)	27.96ms	16.63ms	1.10ms	1.68x	25.41x
TOTAL	1.31s	1.03s	66.34ms	1.27x	19.77x

Hitchhikers SSIM SSIM (`@blazediff/ssim` using `hitchhikers-ssim` vs `ssim.js` using `weber` algorithm) (image IO excluded)

TOTAL TIME · 22 FIXTURES · MEAN OF 25 RUNS · IO EXCLUDED

BlazeDiffOther librariesLower is better

Apple M1 Max · darwin/arm64 · Node v22.14.0 · rustc 1.97.1 (8bab26f4f 2026-07-14) · 2026-10-22 · 234b300-dirty · pnpm benchmark hitchhikers-ssim

Per-fixture results (22)

Fixture	ssim.js	BlazeDiff	BlazeDiff (ssim-native)	BlazeDiff vs ssim.js	BlazeDiff (ssim-native) vs ssim.js
blazediff/1	77.27ms	12.38ms	2.92ms	6.24x	26.42x
blazediff/1 (identical)	77.43ms	12.44ms	3.06ms	6.22x	25.33x
blazediff/2	35.29ms	10.04ms	2.33ms	3.52x	15.16x
blazediff/2 (identical)	40.30ms	10.45ms	2.50ms	3.86x	16.12x
blazediff/3	123ms	47.14ms	10.91ms	2.62x	11.31x
blazediff/3 (identical)	125ms	47.55ms	11.03ms	2.62x	11.29x
blazediff/4	302ms	112ms	25.70ms	2.69x	11.73x
blazediff/4 (identical)	316ms	110ms	25.09ms	2.88x	12.59x
pixelmatch/1	22.72ms	3.75ms	0.84ms	6.07x	27.10x
pixelmatch/1 (identical)	23.13ms	3.91ms	0.88ms	5.91x	26.17x
pixelmatch/2	11.31ms	1.88ms	0.40ms	6.02x	28.14x
pixelmatch/2 (identical)	11.50ms	1.91ms	0.40ms	6.01x	28.48x
pixelmatch/3	22.96ms	3.75ms	0.84ms	6.12x	27.40x
pixelmatch/3 (identical)	23.90ms	3.75ms	0.84ms	6.38x	28.36x
pixelmatch/4	18.61ms	5.15ms	1.16ms	3.61x	15.97x
pixelmatch/4 (identical)	18.70ms	5.44ms	1.18ms	3.44x	15.88x
pixelmatch/5	11.38ms	1.92ms	0.41ms	5.94x	27.75x
pixelmatch/5 (identical)	11.78ms	1.86ms	0.40ms	6.32x	29.19x
pixelmatch/6	11.37ms	1.96ms	0.43ms	5.81x	26.69x
pixelmatch/6 (identical)	11.91ms	1.89ms	0.40ms	6.29x	29.62x
pixelmatch/7	24.87ms	8.65ms	1.71ms	2.87x	14.55x
pixelmatch/7 (identical)	25.05ms	7.20ms	1.64ms	3.48x	15.24x
TOTAL	1.34s	414ms	95.09ms	3.24x	14.14x

Rust1 chart

Rust (`blazediff-ssim` vs `dssim`) (image IO excluded)

TOTAL TIME, BEST-OF · 16 FIXTURES · IO EXCLUDED

BlazeDiffOther librariesLower is better

dssim is a different algorithm (multi-scale, Lab chroma), so this compares cost, not scores.

Apple M1 Max · darwin/arm64 · Node v22.14.0 · rustc 1.97.1 (8bab26f4f 2026-07-14) · best-of, iterations scaled by image size, dssim single-threaded · 2026-10-22 · 234b300-dirty · pnpm benchmark ssim-dssim

Per-fixture results (16)

Fixture	MPx	dssim	ssim	ms-ssim	hitchhikers	ssim vs dssim	ms-ssim vs dssim	hitchhikers vs dssim
4k/1	17.9	1.78s	99.32ms	250ms	131ms	17.93x	7.13x	13.63x
4k/2	20.0	1.80s	117ms	279ms	162ms	15.35x	6.45x	11.12x
4k/3	24.0	2.31s	159ms	331ms	172ms	14.55x	6.98x	13.46x
alpha/1	0.0	4.10ms	0.47ms	0.75ms	0.23ms	8.74x	5.46x	17.67x
blazediff/1	0.4	31.47ms	5.15ms	5.89ms	2.88ms	6.11x	5.34x	10.91x
blazediff/2	0.4	26.45ms	1.54ms	4.95ms	2.29ms	17.16x	5.35x	11.58x
blazediff/3	1.6	113ms	5.07ms	22.99ms	11.21ms	22.24x	4.90x	10.05x
blazediff/4	3.8	252ms	12.28ms	52.49ms	24.92ms	20.53x	4.80x	10.12x
pixelmatch/1	0.1	11.75ms	1.54ms	2.10ms	0.82ms	7.65x	5.60x	14.27x
pixelmatch/2	0.1	6.89ms	0.76ms	1.21ms	0.42ms	9.08x	5.67x	16.57x
pixelmatch/3	0.1	11.61ms	1.59ms	2.19ms	0.87ms	7.28x	5.29x	13.30x
pixelmatch/4	0.2	15.28ms	0.78ms	2.60ms	1.17ms	19.50x	5.87x	13.03x
pixelmatch/5	0.1	6.70ms	0.76ms	1.21ms	0.41ms	8.84x	5.53x	16.19x
pixelmatch/6	0.1	6.68ms	0.75ms	1.21ms	0.41ms	8.95x	5.52x	16.13x
pixelmatch/7	0.3	19.53ms	1.07ms	3.56ms	1.64ms	18.27x	5.48x	11.89x
same/1	1.7	120ms	5.76ms	24.75ms	11.50ms	20.86x	4.85x	10.45x
TOTAL		6.51s	413ms	986ms	523ms	15.78x	6.61x	12.46x

OBJECT

Deep object diffing against microdiff.

JavaScript1 chart

Object (`@blazediff/object` vs `microdiff`)

TOTAL TIME · 8 FIXTURES · MEAN OF 10000 RUNS · IO EXCLUDED

BlazeDiffOther librariesLower is better

Apple M1 Max · darwin/arm64 · Node v22.14.0 · rustc 1.97.1 (8bab26f4f 2026-07-14) · 2026-10-22 · 234b300-dirty · pnpm benchmark object

Per-fixture results (8)

Fixture	Microdiff	BlazeDiff	BlazeDiff vs Microdiff
complex object - tag addition	0.00ms	0.00ms	1.31x
deep nested - timeout change	0.00ms	0.00ms	0.93x
large array - single item change	0.27ms	0.24ms	1.16x
large identical arrays	0.06ms	0.00ms	15.69x
large nested object - multiple small changes	1.59ms	1.50ms	1.06x
nested object - theme change	0.00ms	0.00ms	1.16x
simple object - age change	0.00ms	0.00ms	0.58x
simple object - identical	0.00ms	0.00ms	0.85x
TOTAL	1.92ms	1.74ms	1.10x

PNG CODEC

The blazediff-png codec against spng, image-rs and zune-png in Rust, and against zune-png and jSquash in WebAssembly, decode and encode.

Rust5 charts

Decode (PNG to RGBA8)

TOTAL TIME, BEST-OF · 36 FIXTURES · IO EXCLUDED

BlazeDiffOther librariesLower is better

Apple M1 Max · darwin/arm64 · Node v22.14.0 · rustc 1.97.1 (8bab26f4f 2026-07-14) · best-of, iterations scaled by image size, single-threaded · 2026-10-22 · 234b300-dirty · pnpm benchmark png

Per-fixture results (36)

Fixture	MPx	blazediff	spng	image-rs	zune	blazediff vs spng	image-rs vs spng	zune vs spng
4k/1a.png	17.9	138ms	179ms	152ms	209ms	1.30x	1.18x	0.86x
4k/1b.png	17.9	125ms	187ms	145ms	196ms	1.50x	1.29x	0.95x
4k/2a.png	20.0	158ms	279ms	194ms	234ms	1.76x	1.44x	1.19x
4k/2b.png	20.0	160ms	221ms	196ms	235ms	1.39x	1.13x	0.94x
4k/3a.png	24.0	160ms	220ms	194ms	265ms	1.38x	1.14x	0.83x
4k/3b.png	24.0	160ms	220ms	200ms	266ms	1.37x	1.10x	0.83x
alpha/1a.png	0.0	0.08ms	0.20ms	0.07ms	0.11ms	2.37x	2.64x	1.76x
alpha/1b.png	0.0	0.09ms	0.20ms	0.08ms	0.11ms	2.31x	2.57x	1.73x
blazediff/1a.png	0.4	0.60ms	0.69ms	0.71ms	1.01ms	1.14x	0.97x	0.68x
blazediff/1b.png	0.4	0.60ms	0.70ms	0.71ms	1.01ms	1.15x	0.98x	0.69x
blazediff/2a.png	0.4	0.62ms	0.83ms	0.69ms	0.93ms	1.36x	1.21x	0.90x
blazediff/2b.png	0.4	0.66ms	0.85ms	0.73ms	1.02ms	1.30x	1.17x	0.84x
blazediff/3a.png	1.6	10.86ms	13.38ms	12.10ms	17.55ms	1.23x	1.11x	0.76x
blazediff/3b.png	1.6	10.83ms	13.25ms	12.12ms	17.45ms	1.22x	1.09x	0.76x
blazediff/4a.png	3.8	2.80ms	3.41ms	3.38ms	4.43ms	1.22x	1.01x	0.77x
blazediff/4b.png	3.8	2.93ms	3.48ms	3.42ms	4.49ms	1.19x	1.02x	0.78x
page/1a.png	58.9	156ms	236ms	184ms	255ms	1.52x	1.28x	0.93x
page/1b.png	58.9	156ms	234ms	184ms	246ms	1.50x	1.28x	0.95x
page/2a.png	41.7	26.12ms	36.51ms	20.21ms	47.56ms	1.40x	1.81x	0.77x
page/2b.png	41.7	26.46ms	35.71ms	20.65ms	58.02ms	1.35x	1.73x	0.62x
pixelmatch/1a.png	0.1	0.74ms	0.95ms	0.67ms	1.07ms	1.28x	1.42x	0.89x
pixelmatch/1b.png	0.1	0.55ms	0.71ms	0.53ms	0.89ms	1.30x	1.35x	0.80x
pixelmatch/2a.png	0.1	0.11ms	0.37ms	0.12ms	0.15ms	3.32x	3.03x	2.41x
pixelmatch/2b.png	0.1	0.11ms	0.38ms	0.12ms	0.15ms	3.34x	3.18x	2.43x
pixelmatch/3a.png	0.1	0.50ms	0.73ms	0.47ms	0.74ms	1.46x	1.57x	0.98x
pixelmatch/3b.png	0.1	0.50ms	0.72ms	0.46ms	0.74ms	1.45x	1.56x	0.97x
pixelmatch/4a.png	0.2	1.08ms	1.83ms	1.36ms	1.74ms	1.69x	1.35x	1.06x
pixelmatch/4b.png	0.2	1.31ms	1.75ms	1.36ms	2.20ms	1.34x	1.29x	0.80x
pixelmatch/5a.png	0.1	0.29ms	0.43ms	0.28ms	0.37ms	1.48x	1.53x	1.17x
pixelmatch/5b.png	0.1	0.29ms	0.43ms	0.27ms	0.36ms	1.47x	1.60x	1.19x
pixelmatch/6a.png	0.1	0.35ms	0.66ms	0.38ms	0.46ms	1.87x	1.71x	1.42x
pixelmatch/6b.png	0.1	0.60ms	0.94ms	0.51ms	0.84ms	1.56x	1.85x	1.12x
pixelmatch/7a.png	0.3	0.19ms	0.47ms	0.18ms	0.31ms	2.50x	2.58x	1.49x
pixelmatch/7b.png	0.3	0.18ms	0.46ms	0.19ms	0.31ms	2.58x	2.49x	1.48x
same/1a.png	1.7	2.09ms	2.53ms	2.63ms	9.23ms	1.21x	0.96x	0.27x
same/1b.png	1.7	2.09ms	2.53ms	2.64ms	9.28ms	1.21x	0.96x	0.27x
TOTAL		1.31s	1.90s	1.53s	2.09s	1.46x	1.24x	0.91x

Encode, no compression

TOTAL TIME, BEST-OF · 36 FIXTURES · IO EXCLUDED

BlazeDiffOther librariesLower is better

Levels: blazediff stored · spng stored · image-rs stored · zune stored.

Per-fixture results (36)

Fixture	MPx	blazediff	spng	image-rs	zune	blazediff vs spng	image-rs vs spng	zune vs spng
4k/1a.png	17.9	4.35ms	30.16ms	27.64ms	56.75ms	6.93x	1.09x	0.53x
4k/1b.png	17.9	4.83ms	36.47ms	25.84ms	68.77ms	7.56x	1.41x	0.53x
4k/2a.png	20.0	4.64ms	32.07ms	25.19ms	71.57ms	6.91x	1.27x	0.45x
4k/2b.png	20.0	4.63ms	45.57ms	31.10ms	69.71ms	9.84x	1.47x	0.65x
4k/3a.png	24.0	5.63ms	61.56ms	60.05ms	82.34ms	10.94x	1.03x	0.75x
4k/3b.png	24.0	5.63ms	61.71ms	29.50ms	72.25ms	10.97x	2.09x	0.85x
alpha/1a.png	0.0	0.01ms	0.04ms	0.04ms	0.10ms	4.66x	1.09x	0.43x
alpha/1b.png	0.0	0.01ms	0.04ms	0.04ms	0.10ms	4.69x	1.08x	0.43x
blazediff/1a.png	0.4	0.10ms	0.48ms	0.39ms	1.18ms	4.88x	1.23x	0.40x
blazediff/1b.png	0.4	0.10ms	0.42ms	0.39ms	1.14ms	4.22x	1.09x	0.37x
blazediff/2a.png	0.4	0.09ms	0.36ms	0.31ms	0.94ms	4.26x	1.18x	0.39x
blazediff/2b.png	0.4	0.08ms	0.37ms	0.31ms	0.94ms	4.41x	1.18x	0.39x
blazediff/3a.png	1.6	0.36ms	2.00ms	3.51ms	4.86ms	5.50x	0.57x	0.41x
blazediff/3b.png	1.6	0.36ms	1.98ms	2.28ms	4.92ms	5.50x	0.87x	0.40x
blazediff/4a.png	3.8	0.87ms	5.35ms	5.73ms	11.38ms	6.17x	0.93x	0.47x
blazediff/4b.png	3.8	0.87ms	6.12ms	7.87ms	13.12ms	7.05x	0.78x	0.47x
page/1a.png	58.9	16.84ms	114ms	117ms	192ms	6.76x	0.97x	0.59x
page/1b.png	58.9	22.59ms	108ms	92.34ms	196ms	4.77x	1.17x	0.55x
page/2a.png	41.7	12.32ms	88.23ms	109ms	122ms	7.16x	0.81x	0.72x
page/2b.png	41.7	12.08ms	78.17ms	53.95ms	127ms	6.47x	1.45x	0.62x
pixelmatch/1a.png	0.1	0.03ms	0.16ms	0.10ms	0.34ms	5.05x	1.56x	0.47x
pixelmatch/1b.png	0.1	0.03ms	0.13ms	0.10ms	0.34ms	4.51x	1.33x	0.39x
pixelmatch/2a.png	0.1	0.01ms	0.08ms	0.06ms	0.17ms	5.25x	1.42x	0.45x
pixelmatch/2b.png	0.1	0.01ms	0.08ms	0.05ms	0.17ms	5.39x	1.44x	0.47x
pixelmatch/3a.png	0.1	0.03ms	0.16ms	0.10ms	0.34ms	5.27x	1.55x	0.46x
pixelmatch/3b.png	0.1	0.03ms	0.16ms	0.10ms	0.34ms	5.27x	1.56x	0.47x
pixelmatch/4a.png	0.2	0.04ms	0.18ms	0.15ms	0.47ms	4.06x	1.24x	0.38x
pixelmatch/4b.png	0.2	0.05ms	0.19ms	0.16ms	0.49ms	4.20x	1.16x	0.39x
pixelmatch/5a.png	0.1	0.01ms	0.07ms	0.05ms	0.17ms	4.60x	1.29x	0.40x
pixelmatch/5b.png	0.1	0.01ms	0.08ms	0.05ms	0.17ms	5.38x	1.52x	0.47x
pixelmatch/6a.png	0.1	0.01ms	0.07ms	0.05ms	0.18ms	4.53x	1.25x	0.38x
pixelmatch/6b.png	0.1	0.02ms	0.07ms	0.05ms	0.17ms	4.56x	1.31x	0.41x
pixelmatch/7a.png	0.3	0.06ms	0.24ms	0.20ms	0.65ms	4.07x	1.22x	0.37x
pixelmatch/7b.png	0.3	0.06ms	0.27ms	0.20ms	0.65ms	4.62x	1.38x	0.42x
same/1a.png	1.7	0.40ms	2.07ms	3.45ms	4.98ms	5.17x	0.60x	0.42x
same/1b.png	1.7	0.40ms	2.57ms	3.96ms	5.88ms	6.49x	0.65x	0.44x
TOTAL		97.60ms	679ms	602ms	1.11s	6.96x	1.13x	0.61x

Encode, half compression

TOTAL TIME, BEST-OF · 36 FIXTURES · IO EXCLUDED

BlazeDiffOther librariesLower is better

Levels: blazediff libdeflate 6 · spng zlib 4 · image-rs flate2 4 · zune stored.

Per-fixture results (36)

Fixture	MPx	blazediff	spng	image-rs	zune	blazediff vs spng	image-rs vs spng	zune vs spng
4k/1a.png	17.9	1.15s	2.80s	1.08s	55.06ms	2.43x	2.59x	50.89x
4k/1b.png	17.9	959ms	2.51s	900ms	62.97ms	2.61x	2.78x	39.80x
4k/2a.png	20.0	963ms	3.15s	1.10s	71.73ms	3.27x	2.85x	43.91x
4k/2b.png	20.0	1.01s	3.05s	1.12s	60.27ms	3.02x	2.73x	50.64x
4k/3a.png	24.0	1.41s	3.82s	1.46s	83.12ms	2.70x	2.62x	45.99x
4k/3b.png	24.0	1.41s	3.88s	1.47s	72.03ms	2.75x	2.64x	53.80x
alpha/1a.png	0.0	0.36ms	2.88ms	0.37ms	0.10ms	8.01x	7.84x	30.06x
alpha/1b.png	0.0	0.36ms	2.88ms	0.38ms	0.10ms	7.99x	7.68x	30.03x
blazediff/1a.png	0.4	3.80ms	33.99ms	2.96ms	1.14ms	8.95x	11.48x	29.83x
blazediff/1b.png	0.4	3.83ms	34.20ms	2.96ms	1.15ms	8.92x	11.55x	29.76x
blazediff/2a.png	0.4	3.31ms	27.83ms	2.59ms	0.93ms	8.41x	10.73x	29.78x
blazediff/2b.png	0.4	3.34ms	28.06ms	2.68ms	0.93ms	8.40x	10.49x	30.25x
blazediff/3a.png	1.6	37.88ms	157ms	37.58ms	4.88ms	4.15x	4.18x	32.20x
blazediff/3b.png	1.6	36.72ms	158ms	37.02ms	4.98ms	4.31x	4.28x	31.80x
blazediff/4a.png	3.8	29.16ms	292ms	20.48ms	11.31ms	10.02x	14.26x	25.83x
blazediff/4b.png	3.8	29.18ms	294ms	20.45ms	12.70ms	10.07x	14.37x	23.14x
page/1a.png	58.9	822ms	5.19s	706ms	192ms	6.32x	7.36x	27.00x
page/1b.png	58.9	829ms	5.13s	695ms	194ms	6.19x	7.38x	26.42x
page/2a.png	41.7	629ms	3.67s	595ms	133ms	5.84x	6.17x	27.55x
page/2b.png	41.7	619ms	3.69s	598ms	131ms	5.96x	6.17x	28.23x
pixelmatch/1a.png	0.1	1.65ms	11.24ms	1.72ms	0.34ms	6.82x	6.52x	33.36x
pixelmatch/1b.png	0.1	1.65ms	11.21ms	1.73ms	0.34ms	6.80x	6.47x	32.73x
pixelmatch/2a.png	0.1	2.45ms	8.91ms	3.20ms	0.17ms	3.63x	2.78x	51.41x
pixelmatch/2b.png	0.1	2.49ms	9.20ms	3.31ms	0.18ms	3.70x	2.78x	50.33x
pixelmatch/3a.png	0.1	1.34ms	10.42ms	1.16ms	0.34ms	7.77x	8.99x	30.45x
pixelmatch/3b.png	0.1	1.32ms	10.43ms	1.16ms	0.34ms	7.93x	9.01x	30.87x
pixelmatch/4a.png	0.2	6.97ms	24.69ms	8.84ms	0.47ms	3.54x	2.79x	52.02x
pixelmatch/4b.png	0.2	7.05ms	25.16ms	9.30ms	0.47ms	3.57x	2.71x	53.97x
pixelmatch/5a.png	0.1	0.61ms	5.07ms	0.58ms	0.17ms	8.37x	8.69x	29.47x
pixelmatch/5b.png	0.1	0.61ms	5.06ms	0.58ms	0.17ms	8.36x	8.78x	29.70x
pixelmatch/6a.png	0.1	2.11ms	7.23ms	2.44ms	0.18ms	3.43x	2.96x	40.61x
pixelmatch/6b.png	0.1	2.03ms	6.88ms	2.14ms	0.17ms	3.39x	3.22x	40.20x
pixelmatch/7a.png	0.3	3.77ms	22.39ms	4.05ms	0.64ms	5.95x	5.53x	34.74x
pixelmatch/7b.png	0.3	3.77ms	22.07ms	4.03ms	0.66ms	5.85x	5.47x	33.58x
same/1a.png	1.7	15.40ms	137ms	12.25ms	5.18ms	8.90x	11.19x	26.47x
same/1b.png	1.7	15.70ms	140ms	12.38ms	5.86ms	8.92x	11.30x	23.91x
TOTAL		10.02s	38.37s	9.92s	1.11s	3.83x	3.87x	34.59x

Encode size, no compression

TOTAL OUTPUT SIZE · 36 FIXTURES

BlazeDiffOther librariesLower is better

Levels: blazediff stored · spng stored · image-rs stored · zune stored.

Per-fixture results (36)

Fixture	MPx	blazediff	spng	image-rs	zune	blazediff vs spng	image-rs vs spng	zune vs spng
4k/1a.png	17.9	68.4 MB	68.5 MB	68.4 MB	68.5 MB	99.8%	99.8%	100.0%
4k/1b.png	17.9	68.4 MB	68.5 MB	68.4 MB	68.5 MB	99.8%	99.8%	100.0%
4k/2a.png	20.0	76.2 MB	76.3 MB	76.2 MB	76.3 MB	99.8%	99.8%	100.0%
4k/2b.png	20.0	76.2 MB	76.3 MB	76.2 MB	76.3 MB	99.8%	99.8%	100.0%
4k/3a.png	24.0	91.6 MB	91.7 MB	91.6 MB	91.7 MB	99.9%	99.9%	100.0%
4k/3b.png	24.0	91.6 MB	91.7 MB	91.6 MB	91.7 MB	99.9%	99.9%	100.0%
alpha/1a.png	0.0	144.3 KB	144.5 KB	144.3 KB	144.5 KB	99.8%	99.8%	100.0%
alpha/1b.png	0.0	144.3 KB	144.5 KB	144.3 KB	144.5 KB	99.8%	99.8%	100.0%
blazediff/1a.png	0.4	1.6 MB	1.6 MB	1.6 MB	1.6 MB	99.8%	99.8%	100.0%
blazediff/1b.png	0.4	1.6 MB	1.6 MB	1.6 MB	1.6 MB	99.8%	99.8%	100.0%
blazediff/2a.png	0.4	1.3 MB	1.3 MB	1.3 MB	1.3 MB	99.8%	99.8%	100.0%
blazediff/2b.png	0.4	1.3 MB	1.3 MB	1.3 MB	1.3 MB	99.8%	99.8%	100.0%
blazediff/3a.png	1.6	6.2 MB	6.2 MB	6.2 MB	6.2 MB	99.8%	99.8%	100.0%
blazediff/3b.png	1.6	6.2 MB	6.2 MB	6.2 MB	6.2 MB	99.8%	99.8%	100.0%
blazediff/4a.png	3.8	14.4 MB	14.5 MB	14.4 MB	14.5 MB	99.8%	99.8%	100.0%
blazediff/4b.png	3.8	14.4 MB	14.5 MB	14.4 MB	14.5 MB	99.8%	99.8%	100.0%
page/1a.png	58.9	224.9 MB	225.2 MB	224.9 MB	225.2 MB	99.8%	99.8%	100.0%
page/1b.png	58.9	224.9 MB	225.2 MB	224.9 MB	225.2 MB	99.8%	99.8%	100.0%
page/2a.png	41.7	159.1 MB	159.4 MB	159.1 MB	159.4 MB	99.8%	99.8%	100.0%
page/2b.png	41.7	159.1 MB	159.4 MB	159.1 MB	159.4 MB	99.8%	99.8%	100.0%
pixelmatch/1a.png	0.1	512.4 KB	513.1 KB	512.4 KB	513.1 KB	99.8%	99.8%	100.0%
pixelmatch/1b.png	0.1	512.4 KB	513.1 KB	512.4 KB	513.1 KB	99.8%	99.8%	100.0%
pixelmatch/2a.png	0.1	256.3 KB	256.7 KB	256.3 KB	256.7 KB	99.8%	99.8%	100.0%
pixelmatch/2b.png	0.1	256.3 KB	256.7 KB	256.3 KB	256.7 KB	99.8%	99.8%	100.0%
pixelmatch/3a.png	0.1	512.4 KB	513.1 KB	512.4 KB	513.1 KB	99.8%	99.8%	100.0%
pixelmatch/3b.png	0.1	512.4 KB	513.1 KB	512.4 KB	513.1 KB	99.8%	99.8%	100.0%
pixelmatch/4a.png	0.2	705.4 KB	706.5 KB	705.4 KB	706.5 KB	99.8%	99.8%	100.0%
pixelmatch/4b.png	0.2	705.4 KB	706.5 KB	705.4 KB	706.5 KB	99.8%	99.8%	100.0%
pixelmatch/5a.png	0.1	256.3 KB	256.7 KB	256.3 KB	256.7 KB	99.8%	99.8%	100.0%
pixelmatch/5b.png	0.1	256.3 KB	256.7 KB	256.3 KB	256.7 KB	99.8%	99.8%	100.0%
pixelmatch/6a.png	0.1	256.3 KB	256.7 KB	256.3 KB	256.7 KB	99.8%	99.8%	100.0%
pixelmatch/6b.png	0.1	256.3 KB	256.7 KB	256.3 KB	256.7 KB	99.8%	99.8%	100.0%
pixelmatch/7a.png	0.3	977.2 KB	978.7 KB	977.2 KB	978.6 KB	99.8%	99.8%	100.0%
pixelmatch/7b.png	0.3	977.2 KB	978.7 KB	977.2 KB	978.6 KB	99.8%	99.8%	100.0%
same/1a.png	1.7	6.6 MB	6.6 MB	6.6 MB	6.6 MB	99.8%	99.8%	100.0%
same/1b.png	1.7	6.6 MB	6.6 MB	6.6 MB	6.6 MB	99.8%	99.8%	100.0%
TOTAL		1.28 GB	1.28 GB	1.28 GB	1.28 GB	99.8%	99.8%	100.0%

Encode size, half compression

TOTAL OUTPUT SIZE · 36 FIXTURES

BlazeDiffOther librariesLower is better

Levels: blazediff libdeflate 6 · spng zlib 4 · image-rs flate2 4 · zune stored.

Per-fixture results (36)

Fixture	MPx	blazediff	spng	image-rs	zune	blazediff vs spng	image-rs vs spng	zune vs spng
4k/1a.png	17.9	20.6 MB	21.3 MB	21.5 MB	68.5 MB	96.6%	100.9%	320.8%
4k/1b.png	17.9	17.2 MB	18.2 MB	17.9 MB	68.5 MB	94.5%	98.2%	375.4%
4k/2a.png	20.0	26.1 MB	27.1 MB	26.6 MB	76.3 MB	96.2%	98.3%	281.7%
4k/2b.png	20.0	26.6 MB	27.6 MB	27.2 MB	76.3 MB	96.6%	98.6%	276.8%
4k/3a.png	24.0	32.1 MB	35.0 MB	33.1 MB	91.7 MB	91.7%	94.7%	262.2%
4k/3b.png	24.0	31.6 MB	34.5 MB	32.6 MB	91.7 MB	91.5%	94.4%	265.5%
alpha/1a.png	0.0	2.8 KB	2.9 KB	3.0 KB	144.5 KB	95.3%	100.3%	4908.5%
alpha/1b.png	0.0	2.8 KB	3.0 KB	3.0 KB	144.5 KB	95.2%	99.9%	4826.8%
blazediff/1a.png	0.4	30.8 KB	35.4 KB	30.2 KB	1.6 MB	86.9%	85.4%	4770.7%
blazediff/1b.png	0.4	30.9 KB	35.4 KB	30.3 KB	1.6 MB	87.1%	85.4%	4765.8%
blazediff/2a.png	0.4	31.5 KB	38.1 KB	30.1 KB	1.3 MB	82.6%	79.2%	3610.7%
blazediff/2b.png	0.4	32.8 KB	39.8 KB	31.5 KB	1.3 MB	82.3%	79.2%	3449.9%
blazediff/3a.png	1.6	815.5 KB	877.0 KB	835.0 KB	6.2 MB	93.0%	95.2%	727.6%
blazediff/3b.png	1.6	792.2 KB	853.3 KB	812.1 KB	6.2 MB	92.8%	95.2%	747.8%
blazediff/4a.png	3.8	98.7 KB	114.0 KB	100.5 KB	14.5 MB	86.6%	88.2%	12998.3%
blazediff/4b.png	3.8	98.3 KB	114.1 KB	100.4 KB	14.5 MB	86.1%	88.0%	12985.2%
page/1a.png	58.9	11.1 MB	12.0 MB	11.1 MB	225.2 MB	92.5%	92.5%	1884.8%
page/1b.png	58.9	11.0 MB	11.9 MB	11.0 MB	225.2 MB	92.5%	92.5%	1886.3%
page/2a.png	41.7	10.3 MB	11.0 MB	10.4 MB	159.4 MB	93.9%	94.6%	1446.2%
page/2b.png	41.7	10.4 MB	11.0 MB	10.5 MB	159.4 MB	94.0%	94.8%	1445.4%
pixelmatch/1a.png	0.1	31.8 KB	32.2 KB	33.4 KB	513.1 KB	98.9%	103.6%	1593.4%
pixelmatch/1b.png	0.1	31.9 KB	32.2 KB	33.4 KB	513.1 KB	98.9%	103.5%	1591.6%
pixelmatch/2a.png	0.1	90.8 KB	96.9 KB	91.0 KB	256.7 KB	93.8%	93.9%	265.0%
pixelmatch/2b.png	0.1	94.4 KB	99.9 KB	94.3 KB	256.7 KB	94.4%	94.3%	257.0%
pixelmatch/3a.png	0.1	13.9 KB	14.7 KB	13.8 KB	513.1 KB	94.6%	94.2%	3497.0%
pixelmatch/3b.png	0.1	13.7 KB	14.3 KB	13.5 KB	513.1 KB	95.7%	94.5%	3593.6%
pixelmatch/4a.png	0.2	240.1 KB	254.1 KB	241.3 KB	706.5 KB	94.5%	95.0%	278.0%
pixelmatch/4b.png	0.2	251.0 KB	268.1 KB	251.9 KB	706.5 KB	93.6%	94.0%	263.5%
pixelmatch/5a.png	0.1	3.0 KB	3.3 KB	3.1 KB	256.7 KB	91.4%	92.3%	7693.1%
pixelmatch/5b.png	0.1	3.2 KB	3.3 KB	3.2 KB	256.7 KB	98.5%	98.4%	7793.4%
pixelmatch/6a.png	0.1	44.4 KB	50.7 KB	48.5 KB	256.7 KB	87.6%	95.6%	506.4%
pixelmatch/6b.png	0.1	32.0 KB	37.9 KB	36.5 KB	256.7 KB	84.6%	96.4%	678.0%
pixelmatch/7a.png	0.3	88.2 KB	96.1 KB	87.4 KB	978.6 KB	91.8%	91.0%	1018.8%
pixelmatch/7b.png	0.3	87.3 KB	94.8 KB	86.5 KB	978.6 KB	92.1%	91.2%	1032.4%
same/1a.png	1.7	124.9 KB	140.3 KB	126.7 KB	6.6 MB	89.1%	90.3%	4847.0%
same/1b.png	1.7	124.9 KB	140.3 KB	126.7 KB	6.6 MB	89.1%	90.3%	4847.0%
TOTAL		200.2 MB	213.1 MB	205.1 MB	1.28 GB	93.9%	96.3%	614.8%

WebAssembly5 charts

WebAssembly decode (PNG to RGBA8)

TOTAL TIME, BEST-OF · 36 FIXTURES · IO EXCLUDED

BlazeDiffOther librariesLower is better

Apple M1 Max · darwin/arm64 · Node v22.14.0 · rustc 1.97.1 (8bab26f4f 2026-07-14) · best-of, iterations scaled by image size, single-threaded, Node (V8) running wasm32 with SIMD · 2026-10-26 · 3017cb8-dirty · pnpm benchmark png-wasm

Per-fixture results (36)

Fixture	MPx	blazediff	zune-png	jSquash	blazediff vs jSquash	zune-png vs jSquash
4k/1a.png	17.9	185ms	223ms	398ms	2.15x	1.78x
4k/1b.png	17.9	163ms	206ms	378ms	2.31x	1.84x
4k/2a.png	20.0	224ms	274ms	545ms	2.44x	1.99x
4k/2b.png	20.0	232ms	269ms	547ms	2.36x	2.03x
4k/3a.png	24.0	245ms	310ms	569ms	2.32x	1.83x
4k/3b.png	24.0	242ms	309ms	579ms	2.39x	1.87x
alpha/1a.png	0.0	0.10ms	0.12ms	0.36ms	3.47x	3.13x
alpha/1b.png	0.0	0.11ms	0.11ms	0.36ms	3.32x	3.17x
blazediff/1a.png	0.4	0.85ms	0.97ms	4.32ms	5.09x	4.45x
blazediff/1b.png	0.4	0.80ms	1.00ms	4.35ms	5.47x	4.34x
blazediff/2a.png	0.4	0.74ms	0.88ms	3.66ms	4.92x	4.14x
blazediff/2b.png	0.4	0.80ms	0.97ms	3.71ms	4.67x	3.84x
blazediff/3a.png	1.6	13.48ms	16.19ms	36.66ms	2.72x	2.26x
blazediff/3b.png	1.6	13.52ms	16.08ms	35.38ms	2.62x	2.20x
blazediff/4a.png	3.8	4.40ms	4.74ms	31.96ms	7.26x	6.74x
blazediff/4b.png	3.8	4.51ms	4.78ms	31.67ms	7.02x	6.63x
page/1a.png	58.9	210ms	277ms	626ms	2.97x	2.25x
page/1b.png	58.9	217ms	262ms	610ms	2.80x	2.33x
page/2a.png	41.7	47.61ms	53.70ms	286ms	6.01x	5.33x
page/2b.png	41.7	46.96ms	51.86ms	283ms	6.02x	5.45x
pixelmatch/1a.png	0.1	0.77ms	0.94ms	1.82ms	2.36x	1.94x
pixelmatch/1b.png	0.1	0.61ms	0.81ms	1.81ms	2.98x	2.24x
pixelmatch/2a.png	0.1	0.20ms	0.23ms	0.77ms	3.83x	3.36x
pixelmatch/2b.png	0.1	0.21ms	0.23ms	0.78ms	3.76x	3.31x
pixelmatch/3a.png	0.1	0.58ms	0.67ms	1.52ms	2.60x	2.26x
pixelmatch/3b.png	0.1	0.55ms	0.67ms	1.52ms	2.76x	2.28x
pixelmatch/4a.png	0.2	1.78ms	2.21ms	4.31ms	2.42x	1.95x
pixelmatch/4b.png	0.2	1.99ms	2.37ms	4.68ms	2.35x	1.97x
pixelmatch/5a.png	0.1	0.56ms	0.59ms	1.03ms	1.84x	1.75x
pixelmatch/5b.png	0.1	0.56ms	0.55ms	0.75ms	1.33x	1.36x
pixelmatch/6a.png	0.1	0.68ms	0.67ms	1.32ms	1.93x	1.95x
pixelmatch/6b.png	0.1	0.90ms	0.99ms	1.37ms	1.53x	1.39x
pixelmatch/7a.png	0.3	0.34ms	0.39ms	1.90ms	5.52x	4.88x
pixelmatch/7b.png	0.3	0.34ms	0.41ms	1.88ms	5.48x	4.58x
same/1a.png	1.7	3.54ms	7.37ms	14.08ms	3.98x	1.91x
same/1b.png	1.7	3.56ms	7.43ms	14.03ms	3.95x	1.89x
TOTAL		1.87s	2.31s	5.03s	2.69x	2.18x

WebAssembly encode, no compression

TOTAL TIME, BEST-OF · 36 FIXTURES · IO EXCLUDED

BlazeDiffOther librariesLower is better

Levels: blazediff stored · zune-png stored.

Per-fixture results (36)

Fixture	MPx	blazediff	zune-png	blazediff vs zune-png
4k/1a.png	17.9	44.55ms	71.50ms	1.61x
4k/1b.png	17.9	37.01ms	66.31ms	1.79x
4k/2a.png	20.0	51.72ms	81.47ms	1.58x
4k/2b.png	20.0	42.54ms	74.70ms	1.76x
4k/3a.png	24.0	52.96ms	91.61ms	1.73x
4k/3b.png	24.0	50.30ms	94.01ms	1.87x
alpha/1a.png	0.0	0.09ms	0.14ms	1.60x
alpha/1b.png	0.0	0.09ms	0.14ms	1.57x
blazediff/1a.png	0.4	0.94ms	1.50ms	1.59x
blazediff/1b.png	0.4	0.91ms	1.50ms	1.64x
blazediff/2a.png	0.4	0.75ms	1.19ms	1.59x
blazediff/2b.png	0.4	0.77ms	1.22ms	1.59x
blazediff/3a.png	1.6	3.35ms	6.20ms	1.85x
blazediff/3b.png	1.6	3.42ms	5.85ms	1.71x
blazediff/4a.png	3.8	7.90ms	13.80ms	1.75x
blazediff/4b.png	3.8	7.97ms	13.63ms	1.71x
page/1a.png	58.9	129ms	258ms	1.99x
page/1b.png	58.9	131ms	264ms	2.01x
page/2a.png	41.7	89.78ms	153ms	1.71x
page/2b.png	41.7	88.88ms	156ms	1.76x
pixelmatch/1a.png	0.1	0.28ms	0.45ms	1.62x
pixelmatch/1b.png	0.1	0.28ms	0.47ms	1.64x
pixelmatch/2a.png	0.1	0.14ms	0.24ms	1.66x
pixelmatch/2b.png	0.1	0.14ms	0.23ms	1.60x
pixelmatch/3a.png	0.1	0.28ms	0.45ms	1.59x
pixelmatch/3b.png	0.1	0.27ms	0.46ms	1.66x
pixelmatch/4a.png	0.2	0.38ms	0.61ms	1.62x
pixelmatch/4b.png	0.2	0.39ms	0.63ms	1.63x
pixelmatch/5a.png	0.1	0.14ms	0.24ms	1.63x
pixelmatch/5b.png	0.1	0.14ms	0.23ms	1.61x
pixelmatch/6a.png	0.1	0.14ms	0.22ms	1.60x
pixelmatch/6b.png	0.1	0.14ms	0.22ms	1.62x
pixelmatch/7a.png	0.3	0.52ms	0.85ms	1.64x
pixelmatch/7b.png	0.3	0.52ms	0.86ms	1.68x
same/1a.png	1.7	3.58ms	6.16ms	1.72x
same/1b.png	1.7	3.60ms	6.16ms	1.71x
TOTAL		756ms	1.37s	1.82x

WebAssembly encode, default settings

TOTAL TIME, BEST-OF · 36 FIXTURES · IO EXCLUDED

BlazeDiffOther librariesLower is better

Levels: blazediff fdeflate, adaptive filter · zune-png stored · jSquash png crate default.

Per-fixture results (36)

Fixture	MPx	blazediff	zune-png	jSquash	blazediff vs jSquash	zune-png vs jSquash
4k/1a.png	17.9	236ms	65.81ms	286ms	1.21x	4.35x
4k/1b.png	17.9	225ms	70.29ms	276ms	1.22x	3.92x
4k/2a.png	20.0	234ms	73.03ms	308ms	1.32x	4.22x
4k/2b.png	20.0	240ms	74.41ms	303ms	1.26x	4.07x
4k/3a.png	24.0	304ms	87.89ms	384ms	1.26x	4.37x
4k/3b.png	24.0	304ms	89.58ms	388ms	1.28x	4.33x
alpha/1a.png	0.0	0.16ms	0.14ms	0.23ms	1.39x	1.59x
alpha/1b.png	0.0	0.16ms	0.14ms	0.23ms	1.38x	1.56x
blazediff/1a.png	0.4	3.48ms	1.50ms	3.17ms	0.91x	2.11x
blazediff/1b.png	0.4	3.44ms	1.52ms	3.18ms	0.92x	2.10x
blazediff/2a.png	0.4	1.38ms	1.20ms	2.12ms	1.53x	1.76x
blazediff/2b.png	0.4	1.40ms	1.19ms	2.14ms	1.53x	1.79x
blazediff/3a.png	1.6	17.94ms	6.10ms	18.34ms	1.02x	3.00x
blazediff/3b.png	1.6	17.72ms	5.82ms	17.91ms	1.01x	3.08x
blazediff/4a.png	3.8	23.73ms	13.54ms	19.57ms	0.82x	1.44x
blazediff/4b.png	3.8	23.81ms	13.54ms	19.55ms	0.82x	1.44x
page/1a.png	58.9	485ms	233ms	413ms	0.85x	1.77x
page/1b.png	58.9	480ms	234ms	404ms	0.84x	1.72x
page/2a.png	41.7	207ms	157ms	323ms	1.56x	2.05x
page/2b.png	41.7	191ms	156ms	321ms	1.68x	2.06x
pixelmatch/1a.png	0.1	1.14ms	0.44ms	0.93ms	0.82x	2.10x
pixelmatch/1b.png	0.1	1.19ms	0.47ms	0.96ms	0.81x	2.05x
pixelmatch/2a.png	0.1	0.50ms	0.24ms	0.91ms	1.83x	3.87x
pixelmatch/2b.png	0.1	0.49ms	0.23ms	0.89ms	1.82x	3.92x
pixelmatch/3a.png	0.1	1.12ms	0.45ms	0.81ms	0.73x	1.79x
pixelmatch/3b.png	0.1	1.12ms	0.46ms	0.82ms	0.73x	1.78x
pixelmatch/4a.png	0.2	2.28ms	0.62ms	2.62ms	1.15x	4.26x
pixelmatch/4b.png	0.2	2.28ms	0.64ms	2.75ms	1.21x	4.26x
pixelmatch/5a.png	0.1	0.60ms	0.24ms	0.52ms	0.87x	2.19x
pixelmatch/5b.png	0.1	0.57ms	0.23ms	0.52ms	0.90x	2.28x
pixelmatch/6a.png	0.1	0.80ms	0.22ms	0.80ms	1.00x	3.59x
pixelmatch/6b.png	0.1	0.79ms	0.22ms	0.74ms	0.94x	3.30x
pixelmatch/7a.png	0.3	1.25ms	0.85ms	2.04ms	1.63x	2.41x
pixelmatch/7b.png	0.3	1.22ms	0.86ms	2.06ms	1.69x	2.40x
same/1a.png	1.7	12.78ms	6.16ms	10.73ms	0.84x	1.74x
same/1b.png	1.7	12.82ms	6.16ms	10.69ms	0.83x	1.74x
TOTAL		3.04s	1.30s	3.53s	1.16x	2.71x

WebAssembly encode size, no compression

TOTAL OUTPUT SIZE · 36 FIXTURES

BlazeDiffOther librariesLower is better

Levels: blazediff stored · zune-png stored.

Per-fixture results (36)

Fixture	MPx	blazediff	zune-png	blazediff vs zune-png
4k/1a.png	17.9	68.4 MB	68.5 MB	99.9%
4k/1b.png	17.9	68.4 MB	68.5 MB	99.9%
4k/2a.png	20.0	76.2 MB	76.3 MB	99.9%
4k/2b.png	20.0	76.2 MB	76.3 MB	99.9%
4k/3a.png	24.0	91.6 MB	91.7 MB	99.9%
4k/3b.png	24.0	91.6 MB	91.7 MB	99.9%
alpha/1a.png	0.0	144.3 KB	144.5 KB	99.9%
alpha/1b.png	0.0	144.3 KB	144.5 KB	99.9%
blazediff/1a.png	0.4	1.6 MB	1.6 MB	99.9%
blazediff/1b.png	0.4	1.6 MB	1.6 MB	99.9%
blazediff/2a.png	0.4	1.3 MB	1.3 MB	99.9%
blazediff/2b.png	0.4	1.3 MB	1.3 MB	99.9%
blazediff/3a.png	1.6	6.2 MB	6.2 MB	99.9%
blazediff/3b.png	1.6	6.2 MB	6.2 MB	99.9%
blazediff/4a.png	3.8	14.4 MB	14.5 MB	99.9%
blazediff/4b.png	3.8	14.4 MB	14.5 MB	99.9%
page/1a.png	58.9	224.9 MB	225.2 MB	99.9%
page/1b.png	58.9	224.9 MB	225.2 MB	99.9%
page/2a.png	41.7	159.1 MB	159.4 MB	99.9%
page/2b.png	41.7	159.1 MB	159.4 MB	99.9%
pixelmatch/1a.png	0.1	512.4 KB	513.1 KB	99.9%
pixelmatch/1b.png	0.1	512.4 KB	513.1 KB	99.9%
pixelmatch/2a.png	0.1	256.3 KB	256.7 KB	99.9%
pixelmatch/2b.png	0.1	256.3 KB	256.7 KB	99.9%
pixelmatch/3a.png	0.1	512.4 KB	513.1 KB	99.9%
pixelmatch/3b.png	0.1	512.4 KB	513.1 KB	99.9%
pixelmatch/4a.png	0.2	705.4 KB	706.5 KB	99.9%
pixelmatch/4b.png	0.2	705.4 KB	706.5 KB	99.9%
pixelmatch/5a.png	0.1	256.3 KB	256.7 KB	99.9%
pixelmatch/5b.png	0.1	256.3 KB	256.7 KB	99.9%
pixelmatch/6a.png	0.1	256.3 KB	256.7 KB	99.9%
pixelmatch/6b.png	0.1	256.3 KB	256.7 KB	99.9%
pixelmatch/7a.png	0.3	977.2 KB	978.6 KB	99.9%
pixelmatch/7b.png	0.3	977.2 KB	978.6 KB	99.9%
same/1a.png	1.7	6.6 MB	6.6 MB	99.9%
same/1b.png	1.7	6.6 MB	6.6 MB	99.9%
TOTAL		1.28 GB	1.28 GB	99.9%

WebAssembly encode size, default settings

TOTAL OUTPUT SIZE · 36 FIXTURES

BlazeDiffOther librariesLower is better

Levels: blazediff fdeflate, adaptive filter · zune-png stored · jSquash png crate default.

Per-fixture results (36)

Fixture	MPx	blazediff	zune-png	jSquash	blazediff vs jSquash	zune-png vs jSquash
4k/1a.png	17.9	19.9 MB	68.5 MB	25.8 MB	76.9%	265.1%
4k/1b.png	17.9	18.4 MB	68.5 MB	24.5 MB	74.9%	278.9%
4k/2a.png	20.0	28.0 MB	76.3 MB	37.1 MB	75.5%	205.4%
4k/2b.png	20.0	28.1 MB	76.3 MB	37.1 MB	75.5%	205.3%
4k/3a.png	24.0	35.5 MB	91.7 MB	43.2 MB	82.1%	212.3%
4k/3b.png	24.0	35.1 MB	91.7 MB	42.8 MB	82.0%	214.5%
alpha/1a.png	0.0	2.3 KB	144.5 KB	4.5 KB	51.1%	3235.1%
alpha/1b.png	0.0	2.2 KB	144.5 KB	4.5 KB	49.5%	3187.0%
blazediff/1a.png	0.4	67.9 KB	1.6 MB	152.5 KB	44.5%	1107.5%
blazediff/1b.png	0.4	68.1 KB	1.6 MB	152.8 KB	44.5%	1105.5%
blazediff/2a.png	0.4	19.6 KB	1.3 MB	77.8 KB	25.2%	1766.4%
blazediff/2b.png	0.4	20.2 KB	1.3 MB	79.9 KB	25.3%	1720.1%
blazediff/3a.png	1.6	996.6 KB	6.2 MB	1.2 MB	79.2%	507.3%
blazediff/3b.png	1.6	978.8 KB	6.2 MB	1.2 MB	79.0%	515.2%
blazediff/4a.png	3.8	307.2 KB	14.5 MB	232.3 KB	132.2%	6376.4%
blazediff/4b.png	3.8	328.9 KB	14.5 MB	236.9 KB	138.8%	6254.4%
page/1a.png	58.9	12.4 MB	225.2 MB	16.7 MB	74.3%	1349.0%
page/1b.png	58.9	12.4 MB	225.2 MB	16.7 MB	74.3%	1350.0%
page/2a.png	41.7	6.5 MB	159.4 MB	16.8 MB	38.5%	945.9%
page/2b.png	41.7	6.5 MB	159.4 MB	16.9 MB	38.4%	944.9%
pixelmatch/1a.png	0.1	37.0 KB	513.1 KB	40.0 KB	92.5%	1282.6%
pixelmatch/1b.png	0.1	36.9 KB	513.1 KB	40.0 KB	92.4%	1283.7%
pixelmatch/2a.png	0.1	44.9 KB	256.7 KB	122.3 KB	36.7%	209.9%
pixelmatch/2b.png	0.1	46.0 KB	256.7 KB	124.7 KB	36.9%	205.9%
pixelmatch/3a.png	0.1	27.8 KB	513.1 KB	33.6 KB	82.8%	1527.2%
pixelmatch/3b.png	0.1	27.9 KB	513.1 KB	33.7 KB	82.8%	1521.9%
pixelmatch/4a.png	0.2	280.8 KB	706.5 KB	317.8 KB	88.4%	222.3%
pixelmatch/4b.png	0.2	299.9 KB	706.5 KB	338.2 KB	88.7%	208.9%
pixelmatch/5a.png	0.1	14.6 KB	256.7 KB	43.5 KB	33.5%	589.8%
pixelmatch/5b.png	0.1	13.9 KB	256.7 KB	42.6 KB	32.6%	602.1%
pixelmatch/6a.png	0.1	82.7 KB	256.7 KB	105.0 KB	78.7%	244.5%
pixelmatch/6b.png	0.1	65.5 KB	256.7 KB	87.5 KB	74.9%	293.4%
pixelmatch/7a.png	0.3	51.2 KB	978.6 KB	144.8 KB	35.4%	675.9%
pixelmatch/7b.png	0.3	50.5 KB	978.6 KB	143.2 KB	35.3%	683.6%
same/1a.png	1.7	206.3 KB	6.6 MB	306.2 KB	67.4%	2220.8%
same/1b.png	1.7	206.3 KB	6.6 MB	306.2 KB	67.4%	2220.8%
TOTAL		206.8 MB	1.28 GB	283.2 MB	73.0%	462.5%