diff --git a/StreamRegex.Benchmarks/BufferSizeBenchmarks.cs b/StreamRegex.Benchmarks/BufferSizeBenchmarks.cs
new file mode 100644
index 0000000..3913393
--- /dev/null
+++ b/StreamRegex.Benchmarks/BufferSizeBenchmarks.cs
@@ -0,0 +1,102 @@
+using System.Text.RegularExpressions;
+using BenchmarkDotNet.Attributes;
+using StreamRegex.Extensions;
+using StreamRegex.Lib.DFA;
+using StreamRegex.Lib.NFA;
+
+namespace StreamRegex.Benchmarks;
+[MemoryDiagnoser]
+public class BufferSizeBenchmarks
+{
+    private readonly Regex _compiled;
+    private const string Pattern = "racecar";
+    private Stream _stream = new MemoryStream();
+    public BufferSizeBenchmarks()
+    {
+        _compiled = new Regex(Pattern, RegexOptions.Compiled);
+    }
+
+    [IterationSetup]
+    public void IterationSetup()
+    {
+        _stream = File.OpenRead(TestFileName);
+    }
+
+    [IterationCleanup]
+    public void IterationCleanup()
+    {
+        _stream.Dispose();
+    }
+    
+    //[Params("TargetStart.txt","TargetMiddle.txt","TargetEnd.txt")]
+    [Params("175MB.txt")]
+    public string TestFileName { get; set; }
+    
+    [BenchmarkCategory("Regex")]
+    [Benchmark]
+    public void CompiledRegex()
+    {
+        var content = new StreamReader(_stream).ReadToEnd();
+        if (!_compiled.IsMatch(content))
+        {
+            throw new Exception($"The regex didn't match.");
+        }
+    }
+    
+    [BenchmarkCategory("Regex")]
+    [Benchmark]
+    public void RegexExtension()
+    {
+        var content = new StreamReader(_stream);
+        if (!_compiled.IsMatch(content))
+        {
+            throw new Exception($"The regex didn't match.");
+        }
+    }
+    
+    [BenchmarkCategory("Contains")]
+    [Benchmark(Baseline = true)]
+
+    public void SimpleString()
+    {
+        var match = new StreamReader(_stream).ReadToEnd().IndexOf("racecar");
+        if (match == -1)
+        {
+            throw new Exception($"The regex didn't match.");
+        }
+    }
+    
+    [BenchmarkCategory("Contains")]
+    [Benchmark]
+    public void StringExtension()
+    {
+        var content = new StreamReader(_stream);
+        var match = content.IndexOf("racecar");
+        if (match == -1)
+        {
+            throw new Exception($"The regex didn't match.");
+        }
+    }
+    
+    
+    // [Benchmark]
+    public void StateMachine()
+    {
+        var stateMachine = StateMachineFactory.CreateStateMachine(Pattern);
+        if (stateMachine.GetFirstMatchPosition(_stream) == -1)
+        {
+            throw new Exception("The regex didn't match");
+        }
+    }
+    
+    // [Benchmark]
+    public void NFAStateMachine()
+    {
+        var stateMachine = NfaStateMachineFactory.CreateStateMachine(Pattern);
+        var match = stateMachine.Match(_stream);
+        if (match is null)
+        {
+            throw new Exception("The regex didn't match");
+        }
+    }
+}
\ No newline at end of file
diff --git a/StreamRegex.Benchmarks/PerformanceVsStandard.cs b/StreamRegex.Benchmarks/LargeFileBenchmarks.cs
similarity index 74%
rename from StreamRegex.Benchmarks/PerformanceVsStandard.cs
rename to StreamRegex.Benchmarks/LargeFileBenchmarks.cs
index 23a473f..c4f4b22 100644
--- a/StreamRegex.Benchmarks/PerformanceVsStandard.cs
+++ b/StreamRegex.Benchmarks/LargeFileBenchmarks.cs
@@ -32,7 +32,8 @@ public void IterationCleanup()
     [Params("175MB.txt")]
     public string TestFileName { get; set; }
     
-    [Benchmark(Baseline = true)]
+    [BenchmarkCategory("Regex")]
+    [Benchmark]
     public void CompiledRegex()
     {
         var content = new StreamReader(_stream).ReadToEnd();
@@ -41,7 +42,43 @@ public void CompiledRegex()
             throw new Exception($"The regex didn't match.");
         }
     }
+    
+    [BenchmarkCategory("Regex")]
+    [Benchmark]
+    public void RegexExtension()
+    {
+        var content = new StreamReader(_stream);
+        if (!_compiled.IsMatch(content))
+        {
+            throw new Exception($"The regex didn't match.");
+        }
+    }
+    
+    [BenchmarkCategory("Contains")]
+    [Benchmark(Baseline = true)]
 
+    public void SimpleString()
+    {
+        var match = new StreamReader(_stream).ReadToEnd().IndexOf("racecar");
+        if (match == -1)
+        {
+            throw new Exception($"The regex didn't match.");
+        }
+    }
+    
+    [BenchmarkCategory("Contains")]
+    [Benchmark]
+    public void StringExtension()
+    {
+        var content = new StreamReader(_stream);
+        var match = content.IndexOf("racecar");
+        if (match == -1)
+        {
+            throw new Exception($"The regex didn't match.");
+        }
+    }
+    
+    
     // [Benchmark]
     public void StateMachine()
     {
@@ -62,14 +99,4 @@ public void NFAStateMachine()
             throw new Exception("The regex didn't match");
         }
     }
-    
-    [Benchmark]
-    public void RegexExtension()
-    {
-        var content = new StreamReader(_stream);
-        if (!_compiled.IsMatch(content))
-        {
-            throw new Exception($"The regex didn't match.");
-        }
-    }
 }
\ No newline at end of file
diff --git a/StreamRegex.Benchmarks/Program.cs b/StreamRegex.Benchmarks/Program.cs
index 4d112cf..a810727 100644
--- a/StreamRegex.Benchmarks/Program.cs
+++ b/StreamRegex.Benchmarks/Program.cs
@@ -4,7 +4,7 @@
 using StreamRegex.Lib.DFA;
 using StreamRegex.Lib.NFA;
 
-// var summary = BenchmarkRunner.Run<PerformanceVsStandard>();
+var summary = BenchmarkRunner.Run<PerformanceVsStandard>();
 // NFATest();
 void ExtensionsTest()
 {
diff --git a/StreamRegex.Benchmarks/VariousPositions.cs b/StreamRegex.Benchmarks/VariousPositions.cs
new file mode 100644
index 0000000..e89f5ca
--- /dev/null
+++ b/StreamRegex.Benchmarks/VariousPositions.cs
@@ -0,0 +1,111 @@
+using System.Text;
+using System.Text.RegularExpressions;
+using BenchmarkDotNet.Attributes;
+using StreamRegex.Extensions;
+using StreamRegex.Lib.DFA;
+using StreamRegex.Lib.NFA;
+
+namespace StreamRegex.Benchmarks;
+[MemoryDiagnoser]
+
+// Tests checking for the string "racecar" that only occurs at the end of a very large file.
+public class LargeFileBenchmarks
+{
+    private readonly Regex _compiled;
+    private const string Pattern = "racecar";
+    private Stream _stream = new MemoryStream();
+    private const int _paddingLength = 1024 * 1024 * 100; // 100 MB
+    private StringBuilder _testData = new StringBuilder();
+    public LargeFileBenchmarks()
+    {
+        while (_testData.Length < _paddingLength)
+        {
+            _testData.Append(Enumerable.Repeat("a", 1024));
+        }
+
+        _testData.Append(Pattern);
+        _compiled = new Regex(Pattern, RegexOptions.Compiled);
+    }
+
+    [IterationSetup]
+    public void IterationSetup()
+    {
+        _stream = new MemoryStream(Encoding.UTF8.GetBytes(_testData.ToString()));
+    }
+
+    [IterationCleanup]
+    public void IterationCleanup()
+    {
+        _stream.Dispose();
+    }
+    
+    [BenchmarkCategory("Regex")]
+    [Benchmark]
+    public void CompiledRegex()
+    {
+        var content = new StreamReader(_stream).ReadToEnd();
+        var match = _compiled.Match(content);
+        if (!match.Success || match.Index != _paddingLength)
+        {
+            throw new Exception($"The regex didn't match {match.Index}.");
+        }
+    }
+    
+    [BenchmarkCategory("Regex")]
+    [Benchmark]
+    public void RegexExtension()
+    {
+        var content = new StreamReader(_stream);
+        var match = _compiled.GetFirstMatch(content);
+        if (!match.Success || match.Index != _paddingLength)
+        {
+            throw new Exception($"The regex didn't match {match.Index}.");
+        }
+    }
+    
+    [BenchmarkCategory("Contains")]
+    [Benchmark(Baseline = true)]
+
+    public void SimpleString()
+    {
+        var match = new StreamReader(_stream).ReadToEnd().IndexOf("racecar");
+        if (match != _paddingLength)
+        {
+            throw new Exception($"The regex didn't match {match}.");
+        }
+    }
+    
+    [BenchmarkCategory("Contains")]
+    [Benchmark]
+    public void StringExtension()
+    {
+        var content = new StreamReader(_stream);
+        var match = content.IndexOf("racecar");
+        if (match != _paddingLength)
+        {
+            throw new Exception($"The regex didn't match {match}.");
+        }
+    }
+    
+    
+    // [Benchmark]
+    public void StateMachine()
+    {
+        var stateMachine = StateMachineFactory.CreateStateMachine(Pattern);
+        if (stateMachine.GetFirstMatchPosition(_stream) == -1)
+        {
+            throw new Exception("The regex didn't match");
+        }
+    }
+    
+    // [Benchmark]
+    public void NFAStateMachine()
+    {
+        var stateMachine = NfaStateMachineFactory.CreateStateMachine(Pattern);
+        var match = stateMachine.Match(_stream);
+        if (match is null)
+        {
+            throw new Exception("The regex didn't match");
+        }
+    }
+}
\ No newline at end of file
diff --git a/StreamRegex.Extensions/SlidingBufferExtensions.cs b/StreamRegex.Extensions/SlidingBufferExtensions.cs
index 2dcea23..6509ca3 100644
--- a/StreamRegex.Extensions/SlidingBufferExtensions.cs
+++ b/StreamRegex.Extensions/SlidingBufferExtensions.cs
@@ -10,9 +10,9 @@ public static class SlidingBufferExtensions
     /// <param name="comparison"></param>
     /// <param name="options"></param>
     /// <returns></returns>
-    public static bool Contains(this Stream toMatch, string target, StringComparison comparison, SlidingBufferOptions? options = null)
+    public static bool Contains(this Stream toMatch, string target, StringComparison? comparison = null, SlidingBufferOptions? options = null)
     {
-        return new StreamReader(toMatch).IsMatch(contentChunk => contentChunk.Contains(target, comparison), options);
+        return new StreamReader(toMatch).Contains(target, comparison, options);
     }
 
     /// <summary>
@@ -23,9 +23,11 @@ public static bool Contains(this Stream toMatch, string target, StringComparison
     /// <param name="comparison"></param>
     /// <param name="options"></param>
     /// <returns></returns>
-    public static bool Contains(this StreamReader toMatch, string target, StringComparison comparison, SlidingBufferOptions? options = null)
+    public static bool Contains(this StreamReader toMatch, string target, StringComparison? comparison = null, SlidingBufferOptions? options = null)
     {
-        return toMatch.IsMatch(contentChunk => contentChunk.Contains(target, comparison), options);
+        return comparison is { } notNullComparison ?
+            toMatch.IsMatch(contentChunk => contentChunk.Contains(target, notNullComparison), options) :
+            toMatch.IsMatch(contentChunk => contentChunk.Contains(target), options);
     }
 
     /// <summary>
diff --git a/StreamRegex.Extensions/SlidingBufferMatchCollection.cs b/StreamRegex.Extensions/SlidingBufferMatchCollection.cs
index 44b74bc..6b90b08 100644
--- a/StreamRegex.Extensions/SlidingBufferMatchCollection.cs
+++ b/StreamRegex.Extensions/SlidingBufferMatchCollection.cs
@@ -5,7 +5,7 @@
 namespace StreamRegex.Extensions;
 
 /// <summary>
-/// A collection holding unique <see cref="SlidingBufferMatch"/>.
+/// A collection holding unique <see cref="SlidingBufferMatch"/> for a single resource. The matches are Records which are deduplicated automatically.
 /// </summary>
 public class SlidingBufferMatchCollection<T> : IEnumerable<T> where T : SlidingBufferMatch
 {
@@ -46,15 +46,15 @@ public void AddMatches(IEnumerable<T> matchCollection)
     }
 
     /// <summary>
-    /// Update the index position of the matches in this collection by a specific offset and return the collection.
+    /// Update the index position of the matches in this collection by a specific offset and return the modified collection. Does not make a copy.
     /// </summary>
     /// <param name="offset">The offset to apply</param>
     /// <returns>This collection with the matches modified</returns>
     public SlidingBufferMatchCollection<T> WithOffset(long offset)
     {
-        foreach (var SlidingBufferMatch in _collection)
+        foreach (var slidingBufferMatch in _collection)
         {
-            SlidingBufferMatch.Index += offset;
+            slidingBufferMatch.Index += offset;
         }
 
         return this;