diff --git a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/AsciiString.cs b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/AsciiString.cs
deleted file mode 100644
index 19efc541d..000000000
--- a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/AsciiString.cs
+++ /dev/null
@@ -1,59 +0,0 @@
-// Copyright (c) .NET Foundation. All rights reserved.
-// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
-
-using System;
-using System.Text;
-
-namespace PlatformBenchmarks
-{
-    public readonly struct AsciiString : IEquatable<AsciiString>
-    {
-        private readonly byte[] _data;
-
-        public AsciiString(string s) => _data = Encoding.ASCII.GetBytes(s);
-
-        private AsciiString(byte[] b) => _data = b;
-
-        public int Length => _data.Length;
-
-        public ReadOnlySpan<byte> AsSpan() => _data;
-
-        public static implicit operator ReadOnlySpan<byte>(AsciiString str) => str._data;
-        public static implicit operator byte[] (AsciiString str) => str._data;
-
-        public static implicit operator AsciiString(string str) => new AsciiString(str);
-
-        public override string ToString() => Encoding.ASCII.GetString(_data);
-        public static explicit operator string(AsciiString str) => str.ToString();
-
-        public bool Equals(AsciiString other) => ReferenceEquals(_data, other._data) || SequenceEqual(_data, other._data);
-        private bool SequenceEqual(byte[] data1, byte[] data2) => new Span<byte>(data1).SequenceEqual(data2);
-
-        public static bool operator ==(AsciiString a, AsciiString b) => a.Equals(b);
-        public static bool operator !=(AsciiString a, AsciiString b) => !a.Equals(b);
-        public override bool Equals(object other) => (other is AsciiString) && Equals((AsciiString)other);
-
-        public static AsciiString operator +(AsciiString a, AsciiString b)
-        {
-            var result = new byte[a.Length + b.Length];
-            a._data.CopyTo(result, 0);
-            b._data.CopyTo(result, a.Length);
-            return new AsciiString(result);
-        }
-
-        public override int GetHashCode()
-        {
-            // Copied from x64 version of string.GetLegacyNonRandomizedHashCode()
-            // https://github.com/dotnet/coreclr/blob/master/src/mscorlib/src/System/String.Comparison.cs
-            var data = _data;
-            int hash1 = 5381;
-            int hash2 = hash1;
-            foreach (int b in data)
-            {
-                hash1 = ((hash1 << 5) + hash1) ^ b;
-            }
-            return hash1 + (hash2 * 1566083941);
-        }
-
-    }
-}
diff --git a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/BenchmarkApplication.Plaintext.cs b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/BenchmarkApplication.Plaintext.cs
index 8c6cf15c4..5f9edb358 100644
--- a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/BenchmarkApplication.Plaintext.cs
+++ b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/BenchmarkApplication.Plaintext.cs
@@ -1,15 +1,17 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
+
 namespace PlatformBenchmarks
 {
     public partial class BenchmarkApplication
     {
-        private readonly static AsciiString _plaintextPreamble =
-            _http11OK +
-            _headerServer + _crlf +
-            _headerContentTypeText + _crlf +
-            _headerContentLength + _plainTextBody.Length.ToString();
+        private static ReadOnlySpan<byte> _plaintextPreamble =>
+            "HTTP/1.1 200 OK\r\n"u8 +
+            "Server: K\r\n"u8 +
+            "Content-Type: text/plain\r\n"u8 +
+            "Content-Length: 13"u8;
 
         private static void PlainText(ref BufferWriter<WriterAdapter> writer)
         {
diff --git a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/BenchmarkApplication.cs b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/BenchmarkApplication.cs
index e64048461..5d1f8b541 100644
--- a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/BenchmarkApplication.cs
+++ b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/BenchmarkApplication.cs
@@ -14,28 +14,29 @@
 
 namespace PlatformBenchmarks
 {
-    public partial class BenchmarkApplication
+    public sealed partial class BenchmarkApplication
     {
-        private readonly static AsciiString _applicationName = "Kestrel Platform-Level Application";
-        public static AsciiString ApplicationName => _applicationName;
-
-        private readonly static AsciiString _crlf = "\r\n";
-        private readonly static AsciiString _http11OK = "HTTP/1.1 200 OK\r\n";
-        private readonly static AsciiString _http11NotFound = "HTTP/1.1 404 Not Found\r\n";
-        private readonly static AsciiString _headerServer = "Server: K";
-        private readonly static AsciiString _headerContentLength = "Content-Length: ";
-        private readonly static AsciiString _headerContentLengthZero = "Content-Length: 0";
-        private readonly static AsciiString _headerContentTypeText = "Content-Type: text/plain";
-        private readonly static AsciiString _headerContentTypeJson = "Content-Type: application/json";
-
-        private readonly static AsciiString _dbPreamble =
-            _http11OK +
-            _headerServer + _crlf +
-            _headerContentTypeJson + _crlf +
-            _headerContentLength;
-
-        private readonly static AsciiString _plainTextBody = "Hello, World!";
-        private readonly static AsciiString _contentLengthGap = new string(' ', 4);
+        public static ReadOnlySpan<byte> ApplicationName => "Kestrel Platform-Level Application"u8;
+
+        private static ReadOnlySpan<byte> _crlf => "\r\n"u8;
+        private static ReadOnlySpan<byte> _eoh => "\r\n\r\n"u8; // End Of Headers
+        private static ReadOnlySpan<byte> _http11OK => "HTTP/1.1 200 OK\r\n"u8;
+        private static ReadOnlySpan<byte> _http11NotFound => "HTTP/1.1 404 Not Found\r\n"u8;
+        private static ReadOnlySpan<byte> _headerServer => "Server: K"u8;
+        private static ReadOnlySpan<byte> _headerContentLength => "Content-Length: "u8;
+        private static ReadOnlySpan<byte> _headerContentLengthZero => "Content-Length: 0"u8;
+        private static ReadOnlySpan<byte> _headerContentTypeText => "Content-Type: text/plain"u8;
+        private static ReadOnlySpan<byte> _headerContentTypeJson => "Content-Type: application/json"u8;
+        private static ReadOnlySpan<byte> _headerContentTypeHtml => "Content-Type: text/html; charset=UTF-8"u8;
+
+        private static ReadOnlySpan<byte> _dbPreamble => 
+            "HTTP/1.1 200 OK\r\n"u8 +
+            "Server: K\r\n"u8 +
+            "Content-Type: application/json\r\n"u8 +
+            "Content-Length: "u8;
+
+        private static ReadOnlySpan<byte> _plainTextBody => "Hello, World!"u8;
+        private static ReadOnlySpan<byte> _contentLengthGap => "    "u8;
 
         public static RawDb RawDb { get; set; }
         public static DapperDb DapperDb { get; set; }
@@ -74,15 +75,15 @@ private partial class JsonContext : JsonSerializerContext
 
         public static class Paths
         {
-            public readonly static AsciiString Json = "/json";
-            public readonly static AsciiString Plaintext = "/plaintext";
-            public readonly static AsciiString SingleQuery = "/db";
-            public readonly static AsciiString FortunesRaw = "/fortunes";
-            public readonly static AsciiString FortunesDapper = "/fortunes/dapper";
-            public readonly static AsciiString FortunesEf = "/fortunes/ef";
-            public readonly static AsciiString Updates = "/updates/";
-            public readonly static AsciiString MultipleQueries = "/queries/";
-            public readonly static AsciiString Caching = "/cached-worlds/";
+            public static ReadOnlySpan<byte> Json => "/json"u8;
+            public static ReadOnlySpan<byte> Plaintext => "/plaintext"u8;
+            public static ReadOnlySpan<byte> SingleQuery => "/db"u8;
+            public static ReadOnlySpan<byte> FortunesRaw => "/fortunes"u8;
+            public static ReadOnlySpan<byte> FortunesDapper => "/fortunes/dapper"u8;
+            public static ReadOnlySpan<byte> FortunesEf => "/fortunes/ef"u8;
+            public static ReadOnlySpan<byte> Updates => "/updates/"u8;
+            public static ReadOnlySpan<byte> MultipleQueries => "/queries/"u8;
+            public static ReadOnlySpan<byte> Caching => "/cached-worlds/"u8;
         }
 
         private RequestType _requestType;
@@ -191,11 +192,11 @@ private static Task Default(PipeWriter pipeWriter)
             return Task.CompletedTask;
         }
 #endif
-        private readonly static AsciiString _defaultPreamble =
-            _http11NotFound +
-            _headerServer + _crlf +
-            _headerContentTypeText + _crlf +
-            _headerContentLengthZero;
+        private static ReadOnlySpan<byte> _defaultPreamble =>
+            "HTTP/1.1 200 OK\r\n"u8 +
+            "Server: K"u8 + "\r\n"u8 +
+            "Content-Type: text/plain"u8 +
+            "Content-Length: 0"u8;
 
         private static void Default(ref BufferWriter<WriterAdapter> writer)
         {
diff --git a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Configuration/AppSettings.cs b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Configuration/AppSettings.cs
index 259cf5a34..090e21238 100644
--- a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Configuration/AppSettings.cs
+++ b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Configuration/AppSettings.cs
@@ -3,7 +3,7 @@
 
 namespace PlatformBenchmarks
 {
-    public class AppSettings
+    public sealed class AppSettings
     {
         public string ConnectionString { get; set; }
 
diff --git a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/BatchUpdateString.cs b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/BatchUpdateString.cs
index 83b26ef8f..85273692b 100644
--- a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/BatchUpdateString.cs
+++ b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/BatchUpdateString.cs
@@ -6,7 +6,7 @@
 
 namespace PlatformBenchmarks
 {
-    internal class BatchUpdateString
+    internal sealed class BatchUpdateString
     {
         private const int MaxBatch = 500;
 
diff --git a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/DapperDb.cs b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/DapperDb.cs
index b610c1a39..d3c738f4b 100644
--- a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/DapperDb.cs
+++ b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/DapperDb.cs
@@ -6,7 +6,7 @@
 
 namespace PlatformBenchmarks
 {
-    public class DapperDb
+    public sealed class DapperDb
     {
         private readonly string _connectionString;
 
diff --git a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/EfDb.cs b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/EfDb.cs
index 86a2c9e13..0f2a97de9 100644
--- a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/EfDb.cs
+++ b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/EfDb.cs
@@ -7,7 +7,7 @@
 
 namespace PlatformBenchmarks
 {
-    public class EfDb
+    public sealed class EfDb
     {
         private static PooledDbContextFactory<ApplicationDbContext> _dbContextFactory;
 
diff --git a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/FortuneEf.cs b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/FortuneEf.cs
index c9466c892..9e78d4fbc 100644
--- a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/FortuneEf.cs
+++ b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/FortuneEf.cs
@@ -6,7 +6,7 @@
 namespace PlatformBenchmarks
 {
     [Table("fortune")]
-    public class FortuneEf : IComparable<FortuneEf>, IComparable
+    public sealed class FortuneEf : IComparable<FortuneEf>, IComparable
     {
         [Column("id")]
         public int Id { get; set; }
diff --git a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/Random.cs b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/Random.cs
index 9cb3ef4c3..19daabd05 100644
--- a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/Random.cs
+++ b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/Random.cs
@@ -7,7 +7,7 @@
 
 namespace PlatformBenchmarks
 {
-    public class ConcurrentRandom
+    public sealed class ConcurrentRandom
     {
         private static int nextSeed = 0;
 
diff --git a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/RawDb.cs b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/RawDb.cs
index 9f83617dc..58b1523fb 100644
--- a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/RawDb.cs
+++ b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Data/RawDb.cs
@@ -13,7 +13,7 @@
 
 namespace PlatformBenchmarks
 {
-    public class RawDb
+    public sealed class RawDb
     {
         private readonly ConcurrentRandom _random;
         private readonly MemoryCache _cache
diff --git a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/DateHeader.cs b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/DateHeader.cs
index 6804f572f..c405eb2af 100644
--- a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/DateHeader.cs
+++ b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/DateHeader.cs
@@ -28,7 +28,7 @@ internal static class DateHeader
 
         static DateHeader()
         {
-            var utf8 = Encoding.ASCII.GetBytes("\r\nDate: ").AsSpan();
+            var utf8 = "\r\nDate: "u8;
 
             utf8.CopyTo(s_headerBytesMaster);
             utf8.CopyTo(s_headerBytesScratch);
@@ -61,9 +61,7 @@ private static void SetDateValues(DateTimeOffset value)
                     throw new Exception("date time format failed");
                 }
                 Debug.Assert(written == dateTimeRLength);
-                var temp = s_headerBytesMaster;
-                s_headerBytesMaster = s_headerBytesScratch;
-                s_headerBytesScratch = temp;
+                (s_headerBytesScratch, s_headerBytesMaster) = (s_headerBytesMaster, s_headerBytesScratch);
             }
         }
     }
diff --git a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/HttpApplication.cs b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/HttpApplication.cs
index 48c736ab2..c5d572e40 100644
--- a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/HttpApplication.cs
+++ b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/HttpApplication.cs
@@ -14,7 +14,7 @@ public static class HttpApplicationConnectionBuilderExtensions
         }
     }
 
-    public class HttpApplication<TConnection> where TConnection : IHttpConnection, new()
+    public sealed class HttpApplication<TConnection> where TConnection : IHttpConnection, new()
     {
         public Task ExecuteAsync(ConnectionContext connection)
         {
diff --git a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Program.cs b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Program.cs
index a1a6f1a6f..db4e79ec9 100644
--- a/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Program.cs
+++ b/src/BenchmarksApps/TechEmpower/PlatformBenchmarks/Program.cs
@@ -3,6 +3,7 @@
 
 using System;
 using System.Runtime.InteropServices;
+using System.Text;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.Extensions.Configuration;
@@ -20,17 +21,17 @@ public static async Task Main(string[] args)
         {
             Args = args;
 
-            Console.WriteLine(BenchmarkApplication.ApplicationName);
+            Console.WriteLine(Encoding.UTF8.GetString(BenchmarkApplication.ApplicationName));
 #if !DATABASE
-            Console.WriteLine(BenchmarkApplication.Paths.Plaintext);
-            Console.WriteLine(BenchmarkApplication.Paths.Json);
+            Console.WriteLine(Encoding.UTF8.GetString(BenchmarkApplication.Paths.Plaintext));
+            Console.WriteLine(Encoding.UTF8.GetString(BenchmarkApplication.Paths.Json));
 #else
-            Console.WriteLine(BenchmarkApplication.Paths.FortunesRaw);
-            Console.WriteLine(BenchmarkApplication.Paths.FortunesDapper);
-            Console.WriteLine(BenchmarkApplication.Paths.FortunesEf);
-            Console.WriteLine(BenchmarkApplication.Paths.SingleQuery);
-            Console.WriteLine(BenchmarkApplication.Paths.Updates);
-            Console.WriteLine(BenchmarkApplication.Paths.MultipleQueries);
+            Console.WriteLine(Encoding.UTF8.GetString(BenchmarkApplication.Paths.FortunesRaw));
+            Console.WriteLine(Encoding.UTF8.GetString(BenchmarkApplication.Paths.FortunesDapper));
+            Console.WriteLine(Encoding.UTF8.GetString(BenchmarkApplication.Paths.FortunesEf));
+            Console.WriteLine(Encoding.UTF8.GetString(BenchmarkApplication.Paths.SingleQuery));
+            Console.WriteLine(Encoding.UTF8.GetString(BenchmarkApplication.Paths.Updates));
+            Console.WriteLine(Encoding.UTF8.GetString(BenchmarkApplication.Paths.MultipleQueries));
 #endif
             DateHeader.SyncDateTimer();