json-escape-simd

Optimized SIMD routines for escaping JSON strings. The implementation is from sonic-rs, we only take the string escaping part to avoid the abstraction overhead.

Benchmarks

Numbers below come from cargo bench runs on GitHub Actions hardware. Criterion reports are summarized to make it easier to spot relative performance. "vs fastest" shows how much slower each implementation is compared to the fastest entry in the table (1.00× means fastest).

GitHub Actions x86_64 (ubuntu-latest)

AVX2 enabled.

Short string payload (~89M iterations)

Implementation	Median time	vs fastest
escape simd	56.23 ns	1.00×
escape generic	111.58 ns	1.98×
serde_json	111.65 ns	1.99×
json-escape	140.01 ns	2.49×
escape v_jsonescape	151.98 ns	2.70×
escape sonic	202.21 ns	3.60×

RxJS payload (~10k iterations)

Implementation	Median time	vs fastest
escape simd	246.84 µs	1.00×
escape sonic	261.87 µs	1.06×
escape v_jsonescape	531.77 µs	2.15×
json-escape	561.93 µs	2.28×
escape generic	664.00 µs	2.69×
serde_json	649.19 µs	2.63×

Fixtures payload (~300 iterations)

Implementation	Median time	vs fastest
escape simd	9.1461 ms	1.00×
escape sonic	9.3410 ms	1.02×
json-escape	19.077 ms	2.09×
escape v_jsonescape	20.015 ms	2.19×
serde_json	21.240 ms	2.32×
escape generic	22.512 ms	2.46×

GitHub Actions aarch64 (ubuntu-24.04-arm)

Neon enabled.

Short string payload (~76M iterations)

Implementation	Median time	vs fastest
escape simd	65.42 ns	1.00×
escape generic	108.28 ns	1.66×
serde_json	110.73 ns	1.69×
json-escape	150.64 ns	2.30×
escape v_jsonescape	183.41 ns	2.80×
escape sonic	212.87 ns	3.25×

RxJS payload (~10k iterations)

Implementation	Median time	vs fastest
escape simd	283.40 µs	1.00×
escape sonic	305.34 µs	1.08×
json-escape	468.04 µs	1.65×
escape generic	548.50 µs	1.94×
serde_json	567.23 µs	2.00×
escape v_jsonescape	758.18 µs	2.68×

Fixtures payload (~300 iterations)

Implementation	Median time	vs fastest
escape simd	10.46 ms	1.00×
escape sonic	11.18 ms	1.07×
json-escape	15.45 ms	1.48×
escape generic	17.75 ms	1.70×
serde_json	18.01 ms	1.72×
escape v_jsonescape	24.93 ms	2.38×

GitHub Actions macOS (macos-latest)

Apple M1 chip

Short string payload (~45M iterations)

Implementation	Median time	vs fastest
escape simd	113.16 ns	1.00×
serde_json	128.52 ns	1.14×
escape generic	136.06 ns	1.20×
json-escape	173.16 ns	1.53×
escape v_jsonescape	198.80 ns	1.76×
escape sonic	226.21 ns	2.00×

RxJS payload (~10k iterations)

Implementation	Median time	vs fastest
escape sonic	379.94 µs	1.00×
escape simd	395.41 µs	1.04×
json-escape	618.74 µs	1.63×
escape generic	690.86 µs	1.82×
serde_json	720.05 µs	1.89×
escape v_jsonescape	839.86 µs	2.21×

AFFiNE sources payload (~300 iterations)

Implementation	Median time	vs fastest
escape simd	12.60 ms	1.00×
escape sonic	14.04 ms	1.11×
json-escape	21.54 ms	1.71×
serde_json	23.33 ms	1.85×
escape generic	24.55 ms	1.95×
escape v_jsonescape	26.82 ms	2.13×

Apple M3 Max

Short string benchmark

Implementation	Median time	vs fastest
escape simd	90.58 ns	1.00×
serde_json	139.23 ns	1.54×
escape generic	146.15 ns	1.61×
json-escape	173.60 ns	1.92×
escape v_jsonescape	198.60 ns	2.19×
escape sonic	199.27 ns	2.20×

RxJS payload (~10k iterations)

Implementation	Median time	vs fastest
escape simd	196.07 µs	1.00×
escape sonic	196.32 µs	1.00×
json-escape	446.94 µs	2.28×
escape generic	488.37 µs	2.49×
serde_json	553.08 µs	2.82×
escape v_jsonescape	618.31 µs	3.15×

AFFiNE sources payload (~300 iterations)

Implementation	Median time	vs fastest
escape simd	10.36 ms	1.00×
escape sonic	10.57 ms	1.02×
escape generic	17.61 ms	1.70×
json-escape	18.01 ms	1.74×
serde_json	19.00 ms	1.83×
escape v_jsonescape	21.38 ms	2.06×