diff --git a/OpenRA.Game/Graphics/Sheet.cs b/OpenRA.Game/Graphics/Sheet.cs
index fc880566ec..b6a6c0a764 100644
--- a/OpenRA.Game/Graphics/Sheet.cs
+++ b/OpenRA.Game/Graphics/Sheet.cs
@@ -52,7 +52,7 @@ namespace OpenRA.Graphics
 					}
 					else if (bitmap != null)
 					{
-						texture.SetData(Bitmap);
+						texture.SetData(bitmap);
 						dirty = false;
 					}
 				}
@@ -61,9 +61,7 @@ namespace OpenRA.Graphics
 			}
 		}
 
-		public Bitmap Bitmap { get { if (bitmap == null) bitmap = new Bitmap(Size.Width, Size.Height); return bitmap; } }
 		public byte[] Data { get { if (data == null) data = new byte[4 * Size.Width * Size.Height]; return data; } }
-
 		public void MakeDirty() { dirty = true; }
 	}
 }
diff --git a/OpenRA.Game/Graphics/SpriteFont.cs b/OpenRA.Game/Graphics/SpriteFont.cs
index 026c29ec80..09a9008dc5 100644
--- a/OpenRA.Game/Graphics/SpriteFont.cs
+++ b/OpenRA.Game/Graphics/SpriteFont.cs
@@ -68,8 +68,6 @@ namespace OpenRA.Graphics
 					"chrome");
 				p.X += g.Advance;
 			}
-
-		//	r.Flush();
 		}
 
 		public int2 Measure(string text)
@@ -100,13 +98,20 @@ namespace OpenRA.Graphics
 			unsafe
 			{
 				var p = (byte*)_glyph.bitmap.buffer;
+				var dest = s.sheet.Data;
+				var destStride = s.sheet.Size.Width * 4;
 
 				for (var j = 0; j < s.size.Y; j++)
 				{
 					for (var i = 0; i < s.size.X; i++)
 						if (p[i] != 0)
-							s.sheet.Bitmap.SetPixel(i + s.bounds.Left, j + s.bounds.Top,
-								Color.FromArgb(p[i], c.Second.R, c.Second.G, c.Second.B));
+						{
+							var q = destStride * (j + s.bounds.Top) + 4 * (i + s.bounds.Left);
+							dest[q] = c.Second.B;
+							dest[q + 1] = c.Second.G;
+							dest[q + 2] = c.Second.R;
+							dest[q + 3] = p[i];
+						}
 
 					p += _glyph.bitmap.pitch;
 				}
diff --git a/OpenRA.Game/Graphics/SpriteSheetBuilder.cs b/OpenRA.Game/Graphics/SpriteSheetBuilder.cs
index d4a710df3a..0767e4415d 100644
--- a/OpenRA.Game/Graphics/SpriteSheetBuilder.cs
+++ b/OpenRA.Game/Graphics/SpriteSheetBuilder.cs
@@ -17,7 +17,6 @@ namespace OpenRA.Graphics
 	{
 		public static void Initialize( TileSet tileset )
 		{
-			/* .tem: hack to allow incomplete theaters (interior) to work, falling back to temperate for the missing art */
 			exts = tileset.Extensions;
 			sprites = new Cache<string, Sprite[]>( LoadSprites );
 		}
diff --git a/OpenRA.Game/Graphics/Util.cs b/OpenRA.Game/Graphics/Util.cs
index 4211b97f64..1b70010dba 100644
--- a/OpenRA.Game/Graphics/Util.cs
+++ b/OpenRA.Game/Graphics/Util.cs
@@ -65,42 +65,23 @@ namespace OpenRA.Graphics
 
 		public static void FastCopyIntoChannel(Sprite dest, byte[] src)
 		{
-			var bitmap = dest.sheet.Bitmap;
-			BitmapData bits = null;
-			uint[] channelMasks = { 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000 };
-			int[] shifts = { 16, 8, 0, 24 };
+			var masks = new int[] { 2, 1, 0, 3 };	// hack, our channel order is nuts.
+			var data = dest.sheet.Data;
+			var srcStride = dest.bounds.Width;
+			var destStride = dest.sheet.Size.Width * 4;
+			var destOffset = destStride * dest.bounds.Top + dest.bounds.Left * 4 + masks[(int)dest.channel];
+			var destSkip = destStride - 4 * srcStride;
+			var height = dest.bounds.Height;
 
-			uint mask = channelMasks[(int)dest.channel];
-			int shift = shifts[(int)dest.channel];
-
-			try
+			var srcOffset = 0;
+			for (var j = 0; j < height; j++)
 			{
-				bits = bitmap.LockBits(dest.bounds, ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
-
-				int width = dest.bounds.Width;
-				int height = dest.bounds.Height;
-
-				unsafe
+				for (int i = 0; i < srcStride; i++, srcOffset++)
 				{
-					fixed (byte* srcbase = &src[0])
-					{
-						byte* s = srcbase;
-						uint* t = (uint*)bits.Scan0.ToPointer();
-						int stride = bits.Stride >> 2;
-
-						for (int j = 0; j < height; j++)
-						{
-							uint* p = t;
-							for (int i = 0; i < width; i++, p++)
-								*p = (*p & ~mask) | ((mask & ((uint)*s++) << shift));
-							t += stride;
-						}
-					}
+					data[destOffset] = src[srcOffset];
+					destOffset += 4;
 				}
-			}
-			finally
-			{
-				bitmap.UnlockBits(bits);
+				destOffset += destSkip;
 			}
 		}