diff --git a/BenchmarkTestBench/BenchmarkTestBench.csproj b/BenchmarkTestBench/BenchmarkTestBench.csproj
new file mode 100644
index 0000000..2383364
--- /dev/null
+++ b/BenchmarkTestBench/BenchmarkTestBench.csproj
@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="BenchmarkDotNet" Version="0.14.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\CSharpExtender\CSharpExtender.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/BenchmarkTestBench/Program.cs b/BenchmarkTestBench/Program.cs
new file mode 100644
index 0000000..e383624
--- /dev/null
+++ b/BenchmarkTestBench/Program.cs
@@ -0,0 +1,44 @@
+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Running;
+using CSharpExtender.ExtensionMethods;
+
+// Select assemblies to benchmark
+BenchmarkSwitcher
+    .FromAssembly(typeof(Program).Assembly)
+    .Run(args);
+
+// Create a method in the MyBenchmarks class for each benchmark to perform
+
+// Uncomment one the following lines to run the benchmarks in faster mode
+//[MediumRunJob]
+[ShortRunJob]
+[MemoryDiagnoser]
+public class MyBenchmarks
+{
+    #region Constants for parameters
+
+    private const string LONG_NUMERIC_STRING =
+        @"
+1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
+1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
+1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
+1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
+1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111";
+
+    #endregion
+
+    [Params("1234567890", "1234567890a", "1234567890!@#$%^&*()_+", LONG_NUMERIC_STRING)]
+    public string _testString = "";
+
+    [GlobalSetup]
+    public void Setup()
+    {
+        // Setup code here
+    }
+
+    //[Benchmark]
+    public void Benchmark_IsDigitOnly()
+    {
+        var test = _testString.IsDigitsOnly();
+    }
+}
diff --git a/CSharpExtender.sln b/CSharpExtender.sln
index 6eb83ce..6aa96fb 100644
--- a/CSharpExtender.sln
+++ b/CSharpExtender.sln
@@ -7,6 +7,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CSharpExtender", "CSharpExt
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Test.CSharpExtender", "Test.CSharpExtender\Test.CSharpExtender.csproj", "{E58959C9-A22B-4B5D-9507-B6A2CD8B2607}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BenchmarkTestBench", "BenchmarkTestBench\BenchmarkTestBench.csproj", "{1CF1DAEF-0755-4F06-89CD-6ABCF50A838C}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -21,6 +23,10 @@ Global
 		{E58959C9-A22B-4B5D-9507-B6A2CD8B2607}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{E58959C9-A22B-4B5D-9507-B6A2CD8B2607}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{E58959C9-A22B-4B5D-9507-B6A2CD8B2607}.Release|Any CPU.Build.0 = Release|Any CPU
+		{1CF1DAEF-0755-4F06-89CD-6ABCF50A838C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1CF1DAEF-0755-4F06-89CD-6ABCF50A838C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1CF1DAEF-0755-4F06-89CD-6ABCF50A838C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1CF1DAEF-0755-4F06-89CD-6ABCF50A838C}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/CSharpExtender/ExtensionMethods/StringExtensionMethods.cs b/CSharpExtender/ExtensionMethods/StringExtensionMethods.cs
index f8f3a32..8e0efcb 100644
--- a/CSharpExtender/ExtensionMethods/StringExtensionMethods.cs
+++ b/CSharpExtender/ExtensionMethods/StringExtensionMethods.cs
@@ -72,8 +72,20 @@ public static string ToDigitsOnly(this string value) =>
     /// </summary>
     /// <param name="s"></param>
     /// <returns></returns>
-    public static bool IsDigitsOnly(this string s) =>
-        !s.Any(c => !char.IsDigit(c));
+    public static bool IsDigitsOnly(this string s)
+    {
+        ReadOnlySpan<char> span = s.AsSpan();
+
+        for (int i = 0; i < span.Length; i++)
+        {
+            if (!char.IsDigit(span[i]))
+            {
+                return false;
+            }
+        }
+
+        return true;
+    }
 
     /// <summary>
     /// Converts an IEnumerable of strings to a single string with line feeds between each string