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	1,338,500,000	Fastest	Poor	Minimal standard LCG; fails spectral tests and exhibits lattice artifacts beyond small dimensions.
WaveSplatRandom	1,311,200,000	Fastest	Experimental	Single-word chaotic generator; author notes period 2^64 but provides no formal test results—treat as experimental.
SplitMix64	1,065,500,000	Very Fast	Very Good	Well-known SplitMix64 mixer; passes TestU01 BigCrush and PractRand up to large data sizes in literature. Vigna 2014
BlastCircuitRandom	1,063,400,000	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	943,000,000	Fast	Excellent	Six-word ARX-style generator tuned for all-around use; passes TestU01 BigCrush per upstream reference implementation. Will Stafford Parsons (wileylooper)
PcgRandom	919,000,000	Fast	Excellent	PCG XSH RR 64/32 variant; passes TestU01 BigCrush and PractRand in published results. O'Neill 2014
IllusionFlow	849,900,000	Fast	Excellent	Hybridized PCG + xorshift design; upstream PractRand 64GB passes with no anomalies per author.
RomuDuo	759,500,000	Fast	Very Good	ROMU family member (RomuDuo); authors report strong BigCrush results with minor low-bit weaknesses in some rotations.
XoroShiroRandom	742,500,000	Fast	Very Good	xoshiro128** variant; authors recommend for general-purpose use and report clean BigCrush performance with jump functions. Blackman & Vigna 2019
StormDropRandom	721,400,000	Moderate	Excellent	20-word ARX generator derived from SHISHUA; author reports excellent PractRand performance and long periods.
XorShiftRandom	601,900,000	Moderate	Fair	Classic 32-bit xorshift; known to fail portions of TestU01 and PractRand, acceptable for lightweight effects only. Marsaglia 2003
WyRandom	452,700,000	Slow	Very Good	Wyhash-based generator; published testing shows it clears BigCrush/PractRand with wide seed coverage. Wang Yi 2019
SquirrelRandom	414,300,000	Slow	Good	Hash-based generator built on Squirrel3; good equidistribution for table lookups but not extensively tested beyond moderate ranges. Squirrel Eiserloh
PhotonSpinRandom	268,800,000	Slow	Excellent	SHISHUA-inspired generator; independent testing (PractRand 128GB) by author indicates excellent distribution properties.
UnityRandom	87,100,000	Very Slow	Fair	Mirrors UnityEngine.Random (Xorshift196 + additive); suitable for legacy compatibility but not high-stakes simulation. Unity Random Internals
SystemRandom	65,600,000	Very Slow	Poor	Thin wrapper over System.Random; inherits same LCG weaknesses and fails modern statistical batteries. System.Random considered harmful
DotNetRandom	56,600,000	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	791,900,000	835,000,000	1,338,500,000	184,400,000	381,500,000	589,100,000	505,400,000
WaveSplatRandom	792,100,000	819,300,000	1,311,200,000	184,500,000	411,000,000	532,900,000	464,100,000
SplitMix64	794,900,000	741,600,000	1,065,500,000	183,400,000	352,600,000	488,100,000	445,800,000
BlastCircuitRandom	785,000,000	656,700,000	1,063,400,000	182,600,000	360,100,000	486,400,000	424,300,000
FlurryBurstRandom	786,000,000	649,300,000	943,000,000	180,500,000	287,500,000	455,200,000	408,400,000
PcgRandom	783,900,000	654,600,000	919,000,000	184,300,000	318,600,000	454,500,000	410,100,000
IllusionFlow	778,300,000	640,900,000	849,900,000	178,100,000	296,300,000	446,000,000	395,800,000
RomuDuo	786,300,000	590,000,000	759,500,000	167,200,000	254,700,000	443,500,000	396,200,000
XoroShiroRandom	766,900,000	563,100,000	742,500,000	166,500,000	243,800,000	426,700,000	381,400,000
StormDropRandom	758,200,000	531,300,000	721,400,000	182,100,000	258,900,000	394,700,000	338,100,000
XorShiftRandom	786,200,000	593,500,000	601,900,000	184,300,000	288,000,000	440,400,000	393,100,000
WyRandom	751,000,000	387,500,000	452,700,000	166,400,000	189,300,000	297,400,000	281,700,000
SquirrelRandom	753,500,000	409,100,000	414,300,000	172,300,000	202,200,000	328,800,000	313,300,000
PhotonSpinRandom	708,700,000	256,400,000	268,800,000	121,100,000	123,500,000	216,300,000	210,800,000
UnityRandom	647,000,000	85,000,000	87,100,000	62,200,000	41,500,000	81,700,000	82,400,000
SystemRandom	145,300,000	147,400,000	65,600,000	131,500,000	140,100,000	60,100,000	60,500,000
DotNetRandom	522,600,000	54,600,000	56,600,000	46,200,000	27,000,000	53,900,000	54,000,000