dotnet-substring-bench.md

BenchmarkDotNet=v0.13.1, OS=arch 
AMD Ryzen 7 PRO 4750U with Radeon Graphics, 1 CPU, 16 logical and 8 physical cores
.NET SDK=6.0.100
  [Host]     : .NET 6.0.0 (6.0.21.56401), X64 RyuJIT
  DefaultJob : .NET 6.0.0 (6.0.21.56401), X64 RyuJIT

Method	StringLength	Take	Mean	Error	StdDev	Median
SubstringMethod	50	30	20.625 ns	0.0661 ns	0.0618 ns	20.637 ns
LinqMethod	50	30	402.938 ns	1.7166 ns	1.6057 ns	403.620 ns
SubstringMethod	50	50	1.795 ns	0.0018 ns	0.0014 ns	1.795 ns
LinqMethod	50	50	568.616 ns	1.5141 ns	1.4163 ns	568.938 ns
SubstringMethod	50	100	1.859 ns	0.0532 ns	0.0472 ns	1.881 ns
LinqMethod	50	100	579.650 ns	4.3708 ns	4.0885 ns	580.923 ns
SubstringMethod	50	250	1.832 ns	0.0079 ns	0.0066 ns	1.830 ns
LinqMethod	50	250	581.657 ns	2.2534 ns	1.9975 ns	582.368 ns
SubstringMethod	50	500	1.889 ns	0.0548 ns	0.0513 ns	1.859 ns
LinqMethod	50	500	577.001 ns	1.8593 ns	1.6482 ns	576.912 ns
SubstringMethod	50	750	1.982 ns	0.0070 ns	0.0062 ns	1.980 ns
LinqMethod	50	750	575.279 ns	1.7676 ns	1.3801 ns	575.730 ns
SubstringMethod	50	1000	1.950 ns	0.0051 ns	0.0045 ns	1.951 ns
LinqMethod	50	1000	576.387 ns	1.6418 ns	1.4555 ns	576.774 ns
SubstringMethod	100	30	21.008 ns	0.0769 ns	0.0719 ns	21.007 ns
LinqMethod	100	30	409.292 ns	0.9057 ns	0.7563 ns	409.553 ns
SubstringMethod	100	50	26.941 ns	0.0590 ns	0.0493 ns	26.931 ns
LinqMethod	100	50	598.806 ns	2.3549 ns	2.0875 ns	598.949 ns
SubstringMethod	100	100	1.879 ns	0.0053 ns	0.0050 ns	1.878 ns
LinqMethod	100	100	909.588 ns	1.7740 ns	1.5726 ns	910.137 ns
SubstringMethod	100	250	1.954 ns	0.0752 ns	0.0703 ns	1.900 ns
LinqMethod	100	250	953.044 ns	2.3524 ns	2.0854 ns	952.701 ns
SubstringMethod	100	500	1.886 ns	0.0032 ns	0.0030 ns	1.887 ns
LinqMethod	100	500	924.697 ns	2.7867 ns	2.1757 ns	923.855 ns
SubstringMethod	100	750	2.305 ns	0.0086 ns	0.0076 ns	2.303 ns
LinqMethod	100	750	930.086 ns	13.3432 ns	12.4812 ns	922.939 ns
SubstringMethod	100	1000	1.925 ns	0.0075 ns	0.0067 ns	1.922 ns
LinqMethod	100	1000	932.909 ns	1.9156 ns	1.6982 ns	933.457 ns
SubstringMethod	500	30	20.899 ns	0.0714 ns	0.0596 ns	20.908 ns
LinqMethod	500	30	413.546 ns	1.2667 ns	1.1849 ns	413.573 ns
SubstringMethod	500	50	27.520 ns	0.0430 ns	0.0402 ns	27.537 ns
LinqMethod	500	50	576.767 ns	2.7694 ns	2.5905 ns	575.664 ns
SubstringMethod	500	100	38.448 ns	0.2826 ns	0.2644 ns	38.378 ns
LinqMethod	500	100	966.031 ns	4.6745 ns	4.3725 ns	965.996 ns
SubstringMethod	500	250	81.390 ns	0.1897 ns	0.1774 ns	81.341 ns
LinqMethod	500	250	1,902.541 ns	2.2982 ns	2.0373 ns	1,901.904 ns
SubstringMethod	500	500	1.903 ns	0.0108 ns	0.0091 ns	1.901 ns
LinqMethod	500	500	3,463.136 ns	9.8791 ns	9.2409 ns	3,467.685 ns
SubstringMethod	500	750	1.977 ns	0.0082 ns	0.0076 ns	1.980 ns
LinqMethod	500	750	3,486.980 ns	5.0286 ns	4.1991 ns	3,485.824 ns
SubstringMethod	500	1000	1.825 ns	0.0062 ns	0.0058 ns	1.824 ns
LinqMethod	500	1000	3,450.507 ns	6.3941 ns	5.9810 ns	3,450.266 ns
SubstringMethod	1000	30	21.150 ns	0.0624 ns	0.0553 ns	21.154 ns
LinqMethod	1000	30	423.572 ns	1.7467 ns	1.5484 ns	423.179 ns
SubstringMethod	1000	50	27.403 ns	0.0606 ns	0.0538 ns	27.414 ns
LinqMethod	1000	50	599.775 ns	8.3073 ns	7.7706 ns	603.353 ns
SubstringMethod	1000	100	39.134 ns	0.1707 ns	0.1597 ns	39.169 ns
LinqMethod	1000	100	947.941 ns	2.6026 ns	2.1733 ns	947.720 ns
SubstringMethod	1000	250	82.203 ns	0.1889 ns	0.1675 ns	82.173 ns
LinqMethod	1000	250	1,883.885 ns	2.2884 ns	2.0286 ns	1,884.200 ns
SubstringMethod	1000	500	151.939 ns	0.5527 ns	0.5170 ns	151.924 ns
LinqMethod	1000	500	3,569.682 ns	9.6536 ns	8.0612 ns	3,574.219 ns
SubstringMethod	1000	750	223.917 ns	0.4288 ns	0.3801 ns	224.018 ns
LinqMethod	1000	750	5,259.892 ns	14.5699 ns	13.6287 ns	5,262.228 ns
SubstringMethod	1000	1000	1.994 ns	0.0045 ns	0.0042 ns	1.995 ns
LinqMethod	1000	1000	6,829.357 ns	23.5466 ns	22.0255 ns	6,833.998 ns

Source

namespace SubstringBench;

using System;
using System.Linq;
using BenchmarkDotNet.Attributes;

public class Substring
{
    private string subject = "";

    [Params(50, 100, 500, 1000)]
    public int StringLength { get; set; }

    [Params(30, 50, 100, 250, 500, 750, 1000)]
    public int Take { get; set; }

    [GlobalSetup]
    public void Setup()
    {
        this.subject = new string('Z', this.StringLength);
    }

    [Benchmark]
    public string SubstringMethod() => this.subject.Substring(0, Math.Min(this.subject.Length, this.Take));

    [Benchmark]
    public string LinqMethod() => new string(this.subject.Take(this.Take).ToArray());
}