diff --git a/src/NTwain/DataTransferredEventArgs.cs b/src/NTwain/DataTransferredEventArgs.cs
index 8671ce1..42dbbba 100644
--- a/src/NTwain/DataTransferredEventArgs.cs
+++ b/src/NTwain/DataTransferredEventArgs.cs
@@ -3,6 +3,9 @@ using System;
 
 namespace NTwain
 {
+  // TODO: a 2-level dispose with end of event method
+  // and manual dispose for perf if this is not good enough.
+
   public class DataTransferredEventArgs : EventArgs
   {
     readonly TwainAppSession _twain;
@@ -12,12 +15,13 @@ namespace NTwain
     /// Ctor for array data;
     /// </summary>
     /// <param name="twain"></param>
+    /// <param name="isImage"></param>
     /// <param name="data"></param>
-    internal DataTransferredEventArgs(TwainAppSession twain, byte[] data, bool isImage)
+    internal DataTransferredEventArgs(TwainAppSession twain, bool isImage, byte[] data)
     {
-      this._twain = twain;
+      _twain = twain;
+      _isImage = isImage;
       Data = data;
-      this._isImage = isImage;
     }
 
 
@@ -30,25 +34,17 @@ namespace NTwain
     public byte[]? Data { get; }
 
 
-    TW_IMAGEINFO? _imgInfo;
-
     /// <summary>
-    /// Gets the final image information if applicable.
+    /// Gets the final image information if transfer was an image.
     /// </summary>
-    public TW_IMAGEINFO? ImageInfo
+    public TW_IMAGEINFO? GetImageInfo()
     {
-      get
+      if (_isImage && _twain.GetImageInfo(out TW_IMAGEINFO info).RC == TWRC.SUCCESS)
       {
-        if (_isImage && _imgInfo == null)
-        {
-          if (_twain.GetImageInfo(out TW_IMAGEINFO info).RC == TWRC.SUCCESS)
-          {
-            _imgInfo = info;
-          }
-        }
-        return _imgInfo;
+        return info;
       }
-    }
+      return null;
 
+    }
   }
-}
+}
\ No newline at end of file
diff --git a/src/NTwain/Native/ImageTools.cs b/src/NTwain/Native/ImageTools.cs
index 05e410b..67cc423 100644
--- a/src/NTwain/Native/ImageTools.cs
+++ b/src/NTwain/Native/ImageTools.cs
@@ -24,7 +24,7 @@ namespace NTwain.Native
     }
 
 
-    public static byte[]? GetBitmapData(System.Buffers.ArrayPool<byte> xferMemPool, IntPtr data)
+    public static unsafe byte[]? GetBitmapData(System.Buffers.ArrayPool<byte> xferMemPool, IntPtr data)
     {
       var infoHeader = (BITMAPINFOHEADER)Marshal.PtrToStructure(data, typeof(BITMAPINFOHEADER));
       if (infoHeader.Validate())
@@ -43,12 +43,20 @@ namespace NTwain.Native
 
         var dataCopy = xferMemPool.Rent((int)fileHeader.bfSize);// new byte[fileHeader.bfSize];
 
-        // TODO: reduce extra alloc
+        // TODO: run benchmark on which one is faster
+
         // write file header
-        IntPtr tempPtr = Marshal.AllocHGlobal(fileHeaderSize);
-        Marshal.StructureToPtr(fileHeader, tempPtr, true);
-        Marshal.Copy(tempPtr, dataCopy, 0, fileHeaderSize);
-        Marshal.FreeHGlobal(tempPtr);
+        //IntPtr tempPtr = Marshal.AllocHGlobal(fileHeaderSize);
+        //Marshal.StructureToPtr(fileHeader, tempPtr, true);
+        //Marshal.Copy(tempPtr, dataCopy, 0, fileHeaderSize);
+        //Marshal.FreeHGlobal(tempPtr);
+
+        // would this be faster?
+        fixed (byte* p = dataCopy)
+        {
+          Marshal.StructureToPtr(fileHeader, (IntPtr)p, false);
+        }
+
         // write image
         Marshal.Copy(data, dataCopy, fileHeaderSize, (int)fileHeader.bfSize - fileHeaderSize);
 
diff --git a/src/NTwain/TwainAppSession.Xfers.cs b/src/NTwain/TwainAppSession.Xfers.cs
index 860e9fd..468f727 100644
--- a/src/NTwain/TwainAppSession.Xfers.cs
+++ b/src/NTwain/TwainAppSession.Xfers.cs
@@ -209,7 +209,7 @@ namespace NTwain
           {
             try
             {
-              var args = new DataTransferredEventArgs(this, data, true);
+              var args = new DataTransferredEventArgs(this, true, data);
               DataTransferred?.Invoke(this, args);
             }
             catch { }