From b8187e5b8231148ba532a3f5dae035adfb43346b Mon Sep 17 00:00:00 2001
From: Oli Wilkinson <oli@evolutional.co.uk>
Date: Fri, 11 Dec 2015 14:57:59 -0500
Subject: [PATCH 1/2] Performance tweak to FlatBufferBuilder.CreateString
 method to remove the unnecessary byte buffer allocation

(See https://github.com/google/flatbuffers/issues/55#issuecomment-164031718 for stats)
---
 net/FlatBuffers/FlatBufferBuilder.cs | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/net/FlatBuffers/FlatBufferBuilder.cs b/net/FlatBuffers/FlatBufferBuilder.cs
index 3866d8340..5230b32fb 100644
--- a/net/FlatBuffers/FlatBufferBuilder.cs
+++ b/net/FlatBuffers/FlatBufferBuilder.cs
@@ -276,12 +276,11 @@ namespace FlatBuffers
 
         public StringOffset CreateString(string s)
         {
-            NotNested();
-            byte[] utf8 = Encoding.UTF8.GetBytes(s);
-            AddByte((byte)0);
-            StartVector(1, utf8.Length, 1);
-            Buffer.BlockCopy(utf8, 0, _bb.Data, _space -= utf8.Length,
-                             utf8.Length);
+            NotNested();            
+            AddByte(0);
+            var utf8StringLen = Encoding.UTF8.GetByteCount(s);
+            StartVector(1, utf8StringLen, 1);
+            Encoding.UTF8.GetBytes(s, 0, s.Length, _bb.Data, _space -= utf8StringLen);
             return new StringOffset(EndVector().Value);
         }
 

From be11d2b6ef71f367817000b853724982992d2e45 Mon Sep 17 00:00:00 2001
From: Oli Wilkinson <oli@evolutional.co.uk>
Date: Sat, 12 Dec 2015 11:39:57 -0500
Subject: [PATCH 2/2] C# performance optimization to Pad/Prep methods

---
 net/FlatBuffers/ByteBuffer.cs        | 7 +++++++
 net/FlatBuffers/FlatBufferBuilder.cs | 8 +++-----
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/net/FlatBuffers/ByteBuffer.cs b/net/FlatBuffers/ByteBuffer.cs
index e2a5f2d80..37779b593 100755
--- a/net/FlatBuffers/ByteBuffer.cs
+++ b/net/FlatBuffers/ByteBuffer.cs
@@ -146,6 +146,13 @@ namespace FlatBuffers
             _buffer[offset] = value;
         }
 
+        public void PutByte(int offset, byte value, int count)
+        {
+            AssertOffsetAndLength(offset, sizeof(byte) * count);
+            for (var i = 0; i < count; ++i)
+                _buffer[offset + i] = value;
+        }
+
         // this method exists in order to conform with Java ByteBuffer standards
         public void Put(int offset, byte value)
         {
diff --git a/net/FlatBuffers/FlatBufferBuilder.cs b/net/FlatBuffers/FlatBufferBuilder.cs
index 5230b32fb..7d2115885 100644
--- a/net/FlatBuffers/FlatBufferBuilder.cs
+++ b/net/FlatBuffers/FlatBufferBuilder.cs
@@ -69,10 +69,7 @@ namespace FlatBuffers
 
         public void Pad(int size)
         {
-            for (var i = 0; i < size; i++)
-            {
-                _bb.PutByte(--_space, 0);
-            }
+             _bb.PutByte(_space -= size, 0, size);
         }
 
         // Doubles the size of the ByteBuffer, and copies the old data towards
@@ -116,7 +113,8 @@ namespace FlatBuffers
                 _space += (int)_bb.Length - oldBufSize;
 
             }
-            Pad(alignSize);
+            if (alignSize > 0)
+                Pad(alignSize);
         }
 
         public void PutBool(bool x)