HashSet constructor vs autogrow benchmarks

CollectionBenchmarks.cs

    [MemoryDiagnoser]
    public class CollectionBenchmarks
    {
        string[] items = new string[] { "hello", "world", "some", "and", "one" };

        [Benchmark]
        public HashSet<string> AutoGrow()
        {
            var tpas = new HashSet<string>();
            foreach (var tpa in items)
            {
                tpas.Add(tpa);
            }
            return tpas;
        }

        [Benchmark]
        public HashSet<string> WithCapacityConstructor()
        {
            var tpas = new HashSet<string>(items.Length);

            foreach (var tpa in tpas)
            {
                tpas.Add(tpa);
            }
            return tpas;
        }

        [Benchmark]
        public HashSet<string> WithCollectionConstructor()
        {
            return new HashSet<string>(items);
        }
    }

Results.MD

BenchmarkDotNet=v0.13.1, OS=Windows 10.0.22621
11th Gen Intel Core i7-1185G7 3.00GHz, 1 CPU, 8 logical and 4 physical cores
.NET SDK=7.0.100-preview.7.22377.5
  [Host]     : .NET 6.0.9 (6.0.922.41905), X64 RyuJIT
  DefaultJob : .NET 6.0.9 (6.0.922.41905), X64 RyuJIT

Method	Mean	Error	StdDev	Gen 0	Gen 1	Allocated
AutoGrow	109.70 ns	1.672 ns	1.396 ns	0.0587	0.0001	368 B
WithCapacityConstructor	25.61 ns	0.295 ns	0.261 ns	0.0408	0.0001	256 B
WithCollectionConstructor	107.14 ns	1.452 ns	1.358 ns	0.0459	-	288 B