Performance Random Performance

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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	1,309,300,000	Fastest	Poor	Minimal standard LCG; fails spectral tests and exhibits lattice artifacts beyond small dimensions.
WaveSplatRandom	1,159,700,000	Very Fast	Experimental	Single-word chaotic generator; author notes period 2^64 but provides no formal test results—treat as experimental.
SplitMix64	1,048,800,000	Very Fast	Very Good	Well-known SplitMix64 mixer; passes TestU01 BigCrush and PractRand up to large data sizes in literature. Vigna 2014
BlastCircuitRandom	1,037,300,000	Very Fast	Good	Empirical PractRand testing to 32GB shows strong diffusion; designed as a chaotic ARX mixer rather than a proven statistically optimal generator.
FlurryBurstRandom	938,900,000	Fast	Excellent	Hybrid Xoshiro/PCG variant tuned for all-around use; passes TestU01 BigCrush per upstream reference implementation. Blackman & Vigna 2019
PcgRandom	905,200,000	Fast	Excellent	PCG XSH RR 64/32 variant; passes TestU01 BigCrush and PractRand in published results. O'Neill 2014
IllusionFlow	882,600,000	Fast	Excellent	Hybridized PCG + xorshift design; upstream PractRand 64GB passes with no anomalies per author.
RomuDuo	757,300,000	Fast	Very Good	ROMU family member (RomuDuo); authors report strong BigCrush results with minor low-bit weaknesses in some rotations.
XoroShiroRandom	755,300,000	Fast	Very Good	xoshiro128** variant; authors recommend for general-purpose use and report clean BigCrush performance with jump functions. Blackman & Vigna 2019
StormDropRandom	699,700,000	Moderate	Excellent	20-word ARX generator derived from SHISHUA; author reports excellent PractRand performance and long periods.
XorShiftRandom	593,700,000	Moderate	Fair	Classic 32-bit xorshift; known to fail portions of TestU01 and PractRand, acceptable for lightweight effects only. Marsaglia 2003
WyRandom	448,600,000	Slow	Very Good	Wyhash-based generator; published testing shows it clears BigCrush/PractRand with wide seed coverage. Wang Yi 2019
SquirrelRandom	401,900,000	Slow	Good	Hash-based generator built on Squirrel3; good equidistribution for table lookups but not extensively tested beyond moderate ranges. Squirrel Eiserloh
PhotonSpinRandom	260,200,000	Very Slow	Excellent	SHISHUA-inspired generator; independent testing (PractRand 128GB) by author indicates excellent distribution properties.
UnityRandom	84,200,000	Very Slow	Fair	Mirrors UnityEngine.Random (Xorshift196 + additive); suitable for legacy compatibility but not high-stakes simulation. Unity Random Internals
SystemRandom	63,500,000	Very Slow	Poor	Thin wrapper over System.Random; inherits same LCG weaknesses and fails modern statistical batteries. System.Random considered harmful
DotNetRandom	58,200,000	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	796,900,000	832,800,000	1,309,300,000	210,800,000	408,400,000	586,000,000	502,500,000
WaveSplatRandom	778,800,000	792,200,000	1,159,700,000	204,400,000	375,300,000	515,100,000	454,700,000
SplitMix64	776,700,000	751,900,000	1,048,800,000	210,200,000	367,100,000	479,400,000	439,800,000
BlastCircuitRandom	767,700,000	704,200,000	1,037,300,000	207,800,000	330,500,000	468,300,000	416,200,000
FlurryBurstRandom	775,300,000	642,400,000	938,900,000	210,500,000	332,300,000	446,500,000	406,900,000
PcgRandom	780,500,000	656,800,000	905,200,000	205,900,000	334,400,000	450,400,000	408,500,000
IllusionFlow	778,400,000	631,100,000	882,600,000	202,800,000	320,100,000	442,100,000	391,700,000
RomuDuo	773,500,000	581,000,000	757,300,000	187,500,000	251,600,000	439,100,000	376,300,000
XoroShiroRandom	762,900,000	584,600,000	755,300,000	186,000,000	249,600,000	420,200,000	372,300,000
StormDropRandom	754,700,000	548,500,000	699,700,000	206,400,000	248,700,000	398,000,000	353,200,000
XorShiftRandom	771,000,000	580,900,000	593,700,000	208,300,000	246,400,000	437,500,000	380,900,000
WyRandom	744,500,000	384,500,000	448,600,000	181,800,000	185,600,000	288,100,000	276,700,000
SquirrelRandom	766,500,000	388,600,000	401,900,000	192,500,000	197,600,000	355,700,000	330,700,000
PhotonSpinRandom	693,700,000	247,300,000	260,200,000	129,200,000	113,400,000	212,200,000	201,800,000
UnityRandom	636,500,000	82,000,000	84,200,000	63,500,000	39,600,000	78,900,000	78,600,000
SystemRandom	140,300,000	145,000,000	63,500,000	129,300,000	135,600,000	58,500,000	58,200,000
DotNetRandom	538,000,000	55,200,000	58,200,000	48,300,000	27,600,000	53,500,000	54,100,000