LINQ

Code: https://github.com/rianjs/DotNetPerfTesting/blob/master/PerfTesting/PerfTesting/Linq/PredicateLocation.cs

The basic pattern is:

[Benchmark]
public int FirstLarge()
    => _largeNumbers.First(n => n == 667);

[Benchmark]
public int WhereFirstLarge()
    => _largeNumbers.Where(n => n == 667).First();

And then repeating with Single(), SingleOrDefault(), and repeating again with a smaller array of numbers.

.NET 8 on M3 MacBook Pro

Method	Mean	Error	StdDev	Gen0	Allocated	Speedup %
FirstLarge	655.87 ns	41.464 ns	2.273 ns	0.0038	32 B
WhereFirstLarge	405.15 ns	4.167 ns	0.228 ns	0.0057	48 B	38.2%
FirstOrDefaultLarge	642.73 ns	212.126 ns	11.627 ns	0.0038	32 B
WhereFirstDefaultLarge	405.38 ns	3.845 ns	0.211 ns	0.0057	48 B	37.0%
SingleLarge	951.95 ns	51.710 ns	2.834 ns	0.0038	32 B
WhereSingleLarge	606.69 ns	128.156 ns	7.025 ns	0.0057	48 B	36.3%
SingleOrDefaultLarge	948.28 ns	15.881 ns	0.870 ns	0.0038	32 B
WhereSingleDefaultLarge	604.21 ns	31.579 ns	1.731 ns	0.0057	48 B	36.3%
FirstSmall	32.76 ns	20.769 ns	1.138 ns	0.0038	32 B
WhereFirstSmall	26.84 ns	0.221 ns	0.012 ns	0.0057	48 B	18.1%
FirstOrDefaultSmall	28.50 ns	3.729 ns	0.204 ns	0.0038	32 B
WhereFirstDefaultSmall	26.57 ns	0.048 ns	0.003 ns	0.0057	48 B	6.8%
SingleSmall	49.65 ns	12.350 ns	0.677 ns	0.0038	32 B
WhereSingleSmall	38.79 ns	0.317 ns	0.017 ns	0.0057	48 B	21.9%
SingleOrDefaultSmall	48.62 ns	1.724 ns	0.095 ns	0.0038	32 B
WhereSingleDefaultSmall	38.81 ns	0.868 ns	0.048 ns	0.0057	48 B	20.2%