Performance Random Performance

Random Number Generator Performance Benchmarks

Auto-generated via RandomPerformanceTests.Benchmark. Run the test to refresh these summary and detail tables.

Summary (fastest first)

Random	NextUint (ops/s)	Speed	Quality	Notes
LinearCongruentialGenerator	1,323,700,000	Fastest	Poor	Minimal standard LCG; fails spectral tests and exhibits lattice artifacts beyond small dimensions.
WaveSplatRandom	1,283,400,000	Fastest	Experimental	Single-word chaotic generator; author notes period 2^64 but provides no formal test results—treat as experimental.
BlastCircuitRandom	1,054,900,000	Very Fast	Good	Empirical PractRand testing to 32GB shows strong diffusion; designed as a chaotic ARX mixer rather than a proven statistically optimal generator.
SplitMix64	1,052,300,000	Very Fast	Very Good	Well-known SplitMix64 mixer; passes TestU01 BigCrush and PractRand up to large data sizes in literature. Vigna 2014
FlurryBurstRandom	923,200,000	Fast	Excellent	Six-word ARX-style generator tuned for all-around use; passes TestU01 BigCrush per upstream reference implementation. Will Stafford Parsons (wileylooper)
PcgRandom	897,900,000	Fast	Excellent	PCG XSH RR 64/32 variant; passes TestU01 BigCrush and PractRand in published results. O'Neill 2014
XoroShiroRandom	754,700,000	Fast	Very Good	xoshiro128** variant; authors recommend for general-purpose use and report clean BigCrush performance with jump functions. Blackman & Vigna 2019
IllusionFlow	754,500,000	Fast	Excellent	Hybridized PCG + xorshift design; upstream PractRand 64GB passes with no anomalies per author.
RomuDuo	750,100,000	Fast	Very Good	ROMU family member (RomuDuo); authors report strong BigCrush results with minor low-bit weaknesses in some rotations.
StormDropRandom	705,200,000	Moderate	Excellent	20-word ARX generator derived from SHISHUA; author reports excellent PractRand performance and long periods.
XorShiftRandom	602,100,000	Moderate	Fair	Classic 32-bit xorshift; known to fail portions of TestU01 and PractRand, acceptable for lightweight effects only. Marsaglia 2003
WyRandom	440,500,000	Slow	Very Good	Wyhash-based generator; published testing shows it clears BigCrush/PractRand with wide seed coverage. Wang Yi 2019
SquirrelRandom	414,000,000	Slow	Good	Hash-based generator built on Squirrel3; good equidistribution for table lookups but not extensively tested beyond moderate ranges. Squirrel Eiserloh
PhotonSpinRandom	261,100,000	Very Slow	Excellent	SHISHUA-inspired generator; independent testing (PractRand 128GB) by author indicates excellent distribution properties.
UnityRandom	87,600,000	Very Slow	Fair	Mirrors UnityEngine.Random (Xorshift196 + additive); suitable for legacy compatibility but not high-stakes simulation. Unity Random Internals
SystemRandom	64,700,000	Very Slow	Poor	Thin wrapper over System.Random; inherits same LCG weaknesses and fails modern statistical batteries. System.Random considered harmful
DotNetRandom	55,900,000	Very Slow	Poor	Linear congruential generator (mod 2^31) with known correlation failures; unsuitable for high-quality simulations. System.Random considered harmful

Detailed Metrics

Random	NextBool	Next	NextUint	NextFloat	NextDouble	NextUint (Range)	NextInt (Range)
LinearCongruentialGenerator	785,200,000	538,800,000	1,323,700,000	184,300,000	296,300,000	582,900,000	498,700,000
WaveSplatRandom	787,300,000	528,500,000	1,283,400,000	184,300,000	297,900,000	529,000,000	458,200,000
BlastCircuitRandom	788,200,000	537,400,000	1,054,900,000	183,800,000	293,200,000	479,700,000	421,200,000
SplitMix64	795,900,000	537,200,000	1,052,300,000	184,400,000	297,700,000	482,500,000	439,100,000
FlurryBurstRandom	767,800,000	526,500,000	923,200,000	182,300,000	293,100,000	449,800,000	404,100,000
PcgRandom	249,800,000	527,300,000	897,900,000	181,000,000	274,700,000	447,700,000	405,000,000
XoroShiroRandom	761,000,000	359,000,000	754,700,000	157,900,000	192,400,000	422,100,000	376,900,000
IllusionFlow	779,300,000	529,200,000	754,500,000	183,000,000	281,600,000	439,200,000	390,000,000
RomuDuo	784,600,000	359,400,000	750,100,000	156,100,000	188,700,000	437,700,000	384,600,000
StormDropRandom	776,600,000	523,600,000	705,200,000	180,600,000	252,400,000	393,500,000	356,700,000
XorShiftRandom	783,300,000	534,100,000	602,100,000	184,100,000	283,200,000	474,500,000	383,500,000
WyRandom	749,500,000	363,000,000	440,500,000	159,000,000	185,300,000	290,000,000	277,800,000
SquirrelRandom	756,300,000	382,700,000	414,000,000	158,800,000	197,800,000	355,500,000	309,500,000
PhotonSpinRandom	713,300,000	220,800,000	261,100,000	119,900,000	115,800,000	217,600,000	214,200,000
UnityRandom	628,900,000	76,700,000	87,600,000	59,700,000	38,800,000	81,800,000	81,900,000
SystemRandom	146,200,000	145,700,000	64,700,000	131,300,000	138,600,000	58,700,000	57,800,000
DotNetRandom	544,600,000	53,100,000	55,900,000	44,700,000	26,700,000	53,400,000	51,700,000