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	1,323,600,000	Fastest	Poor	Minimal standard LCG; fails spectral tests and exhibits lattice artifacts beyond small dimensions.
WaveSplatRandom	1,171,900,000	Very Fast	Experimental	Single-word chaotic generator; author notes period 2^64 but provides no formal test results—treat as experimental.
BlastCircuitRandom	1,054,000,000	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	1,044,400,000	Very Fast	Very Good	Well-known SplitMix64 mixer; passes TestU01 BigCrush and PractRand up to large data sizes in literature. Vigna 2014
FlurryBurstRandom	923,800,000	Fast	Excellent	Six-word ARX-style generator tuned for all-around use; passes TestU01 BigCrush per upstream reference implementation. Will Stafford Parsons (wileylooper)
PcgRandom	918,200,000	Fast	Excellent	PCG XSH RR 64/32 variant; passes TestU01 BigCrush and PractRand in published results. O'Neill 2014
IllusionFlow	844,500,000	Fast	Excellent	Hybridized PCG + xorshift design; upstream PractRand 64GB passes with no anomalies per author.
XoroShiroRandom	756,600,000	Fast	Very Good	xoshiro128** variant; authors recommend for general-purpose use and report clean BigCrush performance with jump functions. Blackman & Vigna 2019
RomuDuo	746,400,000	Fast	Very Good	ROMU family member (RomuDuo); authors report strong BigCrush results with minor low-bit weaknesses in some rotations.
StormDropRandom	712,800,000	Moderate	Excellent	20-word ARX generator derived from SHISHUA; author reports excellent PractRand performance and long periods.
XorShiftRandom	594,200,000	Moderate	Fair	Classic 32-bit xorshift; known to fail portions of TestU01 and PractRand, acceptable for lightweight effects only. Marsaglia 2003
WyRandom	446,800,000	Slow	Very Good	Wyhash-based generator; published testing shows it clears BigCrush/PractRand with wide seed coverage. Wang Yi 2019
SquirrelRandom	407,100,000	Slow	Good	Hash-based generator built on Squirrel3; good equidistribution for table lookups but not extensively tested beyond moderate ranges. Squirrel Eiserloh
PhotonSpinRandom	260,100,000	Very Slow	Excellent	SHISHUA-inspired generator; independent testing (PractRand 128GB) by author indicates excellent distribution properties.
UnityRandom	86,400,000	Very Slow	Fair	Mirrors UnityEngine.Random (Xorshift196 + additive); suitable for legacy compatibility but not high-stakes simulation. Unity Random Internals
SystemRandom	64,100,000	Very Slow	Poor	Thin wrapper over System.Random; inherits same LCG weaknesses and fails modern statistical batteries. System.Random considered harmful
DotNetRandom	57,200,000	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	783,800,000	833,800,000	1,323,600,000	182,100,000	375,300,000	583,500,000	499,500,000
WaveSplatRandom	784,400,000	807,500,000	1,171,900,000	181,900,000	405,500,000	530,000,000	461,200,000
BlastCircuitRandom	775,200,000	703,900,000	1,054,000,000	181,500,000	360,500,000	476,600,000	422,300,000
SplitMix64	737,500,000	705,400,000	1,044,400,000	181,900,000	372,700,000	482,400,000	441,800,000
FlurryBurstRandom	766,300,000	678,200,000	923,800,000	181,300,000	336,700,000	449,700,000	399,800,000
PcgRandom	773,200,000	665,800,000	918,200,000	181,600,000	313,100,000	450,000,000	406,300,000
IllusionFlow	774,400,000	629,900,000	844,500,000	174,800,000	294,200,000	439,100,000	391,200,000
XoroShiroRandom	759,600,000	583,400,000	756,600,000	164,600,000	252,100,000	420,900,000	376,000,000
RomuDuo	777,000,000	586,100,000	746,400,000	164,800,000	252,300,000	438,900,000	390,400,000
StormDropRandom	755,200,000	569,300,000	712,800,000	180,600,000	270,300,000	396,400,000	359,100,000
XorShiftRandom	785,800,000	583,100,000	594,200,000	181,600,000	285,900,000	434,400,000	387,700,000
WyRandom	739,600,000	385,100,000	446,800,000	164,200,000	183,800,000	291,200,000	277,500,000
SquirrelRandom	742,300,000	405,300,000	407,100,000	169,800,000	199,100,000	329,600,000	310,900,000
PhotonSpinRandom	693,800,000	247,600,000	260,100,000	118,900,000	119,200,000	209,800,000	203,300,000
UnityRandom	632,700,000	83,600,000	86,400,000	61,400,000	40,800,000	80,400,000	81,100,000
SystemRandom	142,100,000	145,400,000	64,100,000	130,800,000	130,900,000	59,000,000	59,000,000
DotNetRandom	518,800,000	54,400,000	57,200,000	46,100,000	26,900,000	53,800,000	52,800,000