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	1,333,700,000	Fastest	Poor	Minimal standard LCG; fails spectral tests and exhibits lattice artifacts beyond small dimensions.
WaveSplatRandom	1,323,500,000	Fastest	Experimental	Single-word chaotic generator; author notes period 2^64 but provides no formal test results—treat as experimental.
BlastCircuitRandom	1,068,900,000	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	1,042,200,000	Very Fast	Very Good	Well-known SplitMix64 mixer; passes TestU01 BigCrush and PractRand up to large data sizes in literature. Vigna 2014
FlurryBurstRandom	947,500,000	Fast	Excellent	Hybrid Xoshiro/PCG variant tuned for all-around use; passes TestU01 BigCrush per upstream reference implementation. Blackman & Vigna 2019
PcgRandom	916,300,000	Fast	Excellent	PCG XSH RR 64/32 variant; passes TestU01 BigCrush and PractRand in published results. O'Neill 2014
IllusionFlow	891,400,000	Fast	Excellent	Hybridized PCG + xorshift design; upstream PractRand 64GB passes with no anomalies per author.
XoroShiroRandom	762,900,000	Fast	Very Good	xoshiro128** variant; authors recommend for general-purpose use and report clean BigCrush performance with jump functions. Blackman & Vigna 2019
RomuDuo	757,900,000	Fast	Very Good	ROMU family member (RomuDuo); authors report strong BigCrush results with minor low-bit weaknesses in some rotations.
StormDropRandom	713,500,000	Moderate	Excellent	20-word ARX generator derived from SHISHUA; author reports excellent PractRand performance and long periods.
XorShiftRandom	599,800,000	Moderate	Fair	Classic 32-bit xorshift; known to fail portions of TestU01 and PractRand, acceptable for lightweight effects only. Marsaglia 2003
WyRandom	440,100,000	Slow	Very Good	Wyhash-based generator; published testing shows it clears BigCrush/PractRand with wide seed coverage. Wang Yi 2019
SquirrelRandom	409,000,000	Slow	Good	Hash-based generator built on Squirrel3; good equidistribution for table lookups but not extensively tested beyond moderate ranges. Squirrel Eiserloh
PhotonSpinRandom	260,200,000	Very Slow	Excellent	SHISHUA-inspired generator; independent testing (PractRand 128GB) by author indicates excellent distribution properties.
UnityRandom	86,800,000	Very Slow	Fair	Mirrors UnityEngine.Random (Xorshift196 + additive); suitable for legacy compatibility but not high-stakes simulation. Unity Random Internals
SystemRandom	64,200,000	Very Slow	Poor	Thin wrapper over System.Random; inherits same LCG weaknesses and fails modern statistical batteries. System.Random considered harmful
DotNetRandom	54,300,000	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	812,500,000	844,800,000	1,333,700,000	184,600,000	387,000,000	580,800,000	505,400,000
WaveSplatRandom	780,800,000	721,900,000	1,323,500,000	182,500,000	400,700,000	532,600,000	463,400,000
BlastCircuitRandom	785,700,000	716,200,000	1,068,900,000	183,300,000	353,100,000	485,400,000	422,600,000
SplitMix64	777,700,000	774,200,000	1,042,200,000	183,200,000	362,300,000	484,000,000	436,100,000
FlurryBurstRandom	771,200,000	678,400,000	947,500,000	183,500,000	311,600,000	445,700,000	405,200,000
PcgRandom	777,500,000	673,700,000	916,300,000	184,200,000	328,700,000	454,100,000	409,400,000
IllusionFlow	789,200,000	641,300,000	891,400,000	177,800,000	309,100,000	445,700,000	396,000,000
XoroShiroRandom	770,000,000	592,300,000	762,900,000	165,800,000	242,400,000	427,700,000	381,800,000
RomuDuo	783,100,000	592,000,000	757,900,000	164,500,000	249,800,000	443,500,000	394,800,000
StormDropRandom	776,100,000	568,200,000	713,500,000	181,400,000	264,100,000	397,600,000	364,300,000
XorShiftRandom	779,800,000	587,300,000	599,800,000	183,300,000	272,400,000	432,200,000	388,700,000
WyRandom	749,900,000	380,600,000	440,100,000	164,700,000	186,700,000	293,600,000	274,300,000
SquirrelRandom	759,200,000	407,200,000	409,000,000	169,500,000	193,400,000	331,400,000	311,200,000
PhotonSpinRandom	701,900,000	246,500,000	260,200,000	118,000,000	117,000,000	211,300,000	204,300,000
UnityRandom	623,500,000	84,100,000	86,800,000	61,200,000	41,000,000	80,400,000	81,400,000
SystemRandom	147,100,000	148,100,000	64,200,000	130,900,000	137,700,000	58,500,000	56,900,000
DotNetRandom	539,800,000	52,500,000	54,300,000	45,800,000	26,700,000	53,500,000	53,000,000