diff --git a/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.cs b/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.cs
index 5bc755fa56..771eb088e3 100644
--- a/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.cs
+++ b/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.cs
@@ -517,7 +517,7 @@ namespace BizHawk.Client.EmuHawk
 		private string GenerateMemoryViewString(bool forWindow)
 		{
 			var rowStr = new StringBuilder();
-
+			var test = MakeValues();
 			for (var i = 0; i < _rowsVisible; i++)
 			{
 				_row = i + HexScrollBar.Value;
@@ -531,21 +531,23 @@ namespace BizHawk.Client.EmuHawk
 				{
 					if (_addr + j + DataSize <= _domain.Size)
 					{
-						int tVal = 0;
-						for (int k = 0; k < DataSize; k++)
-						{
-							int tNext = MakeValue(1, _addr + j + k);
-							if (BigEndian)
-							{
-								tVal += (tNext << (k * 8));
-							}
-							else
-							{
-								tVal += (tNext << ((DataSize - k - 1) * 8));
-							}
-						}
+						var addressVal = test[_addr + j];
+						rowStr.AppendFormat(_digitFormatString, addressVal);
+						//int tVal = 0;
+						//for (int k = 0; k < DataSize; k++)
+						//{
+						//	int tNext = MakeValue(1, _addr + j + k);
+						//	if (BigEndian)
+						//	{
+						//		tVal += (tNext << (k * 8));
+						//	}
+						//	else
+						//	{
+						//		tVal += (tNext << ((DataSize - k - 1) * 8));
+						//	}
+						//}
 
-						rowStr.AppendFormat(_digitFormatString, tVal);
+						//rowStr.AppendFormat(_digitFormatString, tVal);
 					}
 					else
 					{
@@ -577,6 +579,70 @@ namespace BizHawk.Client.EmuHawk
 			return rowStr.ToString();
 		}
 
+		private Dictionary<long, long> MakeValues()
+		{
+			var addresses = new List<long>();
+
+			for (var i = 0; i < _rowsVisible; i++)
+			{
+				_row = i + HexScrollBar.Value;
+				_addr = _row << 4;
+				if (_addr >= _domain.Size)
+				{
+					break;
+				}
+
+				for (var j = 0; j < 16; j += DataSize)
+				{
+					if (_addr + j + DataSize <= _domain.Size)
+					{
+						var address = _addr + j;
+						addresses.Add(address);
+					}
+				}
+			}
+
+			Dictionary<long, long> dict = new Dictionary<long, long>();
+			var range = new MutableRange<long>(addresses[0], addresses[0] + addresses.Count);
+
+			switch (DataSize)
+			{
+				default:
+				case 1:
+				{
+						var vals = new byte[addresses.Count];
+						_domain.BulkPeekByte(range, vals);
+						for (var i = 0; i < addresses.Count; i++)
+						{
+							dict.Add(addresses[i], vals[i]);
+						}
+						break;
+					}
+				case 2:
+					{
+						var vals = new ushort[addresses.Count];
+						_domain.BulkPeekUshort(range, BigEndian, vals);
+						for (var i = 0; i < addresses.Count; i++)
+						{
+							dict.Add(addresses[i], vals[i]);
+						}
+						break;
+					}
+				case 4:
+					{
+						var vals = new uint[addresses.Count];
+						_domain.BulkPeekUint(range, BigEndian, vals);
+						for (var i = 0; i < addresses.Count; i++)
+						{
+							dict.Add(addresses[i], vals[i]);
+						}
+						break;
+					}
+			}
+
+			return dict;
+		}
+
 		private byte MakeByte(long address)
 		{
 			return Global.CheatList.IsActive(_domain, address)
diff --git a/BizHawk.Emulation.Common/Base Implementations/MemoryDomain.cs b/BizHawk.Emulation.Common/Base Implementations/MemoryDomain.cs
index cb449a9211..a45eeaa8d8 100644
--- a/BizHawk.Emulation.Common/Base Implementations/MemoryDomain.cs	
+++ b/BizHawk.Emulation.Common/Base Implementations/MemoryDomain.cs	
@@ -1,4 +1,7 @@
-namespace BizHawk.Emulation.Common
+using System;
+using BizHawk.Common;
+
+namespace BizHawk.Emulation.Common
 {
 	/// <summary>
 	/// A memory region and the functionality to read/write from it
@@ -100,5 +103,59 @@
 					break;
 			}
 		}
+
+		public virtual void BulkPeekByte(Range<long> addresses, byte[] values)
+		{
+			if (addresses == null || values == null)
+			{
+				throw new ArgumentException();
+			}
+
+			if (addresses.EndInclusive - addresses.Start != values.Length)
+			{
+				throw new InvalidOperationException("Invalid length of values array");
+			}
+
+			for (var i = addresses.Start; i < addresses.EndInclusive; i++)
+			{
+				values[i] = PeekByte(i);
+			}
+		}
+
+		public virtual void BulkPeekUshort(Range<long> addresses,  bool bigEndian, ushort[] values)
+		{
+			if (addresses == null || values == null)
+			{
+				throw new ArgumentException();
+			}
+
+			if (addresses.EndInclusive - addresses.Start != values.Length)
+			{
+				throw new InvalidOperationException("Invalid length of values array");
+			}
+
+			for (var i = addresses.Start; i < addresses.EndInclusive; i++)
+			{
+				values[i] = PeekUshort(i, bigEndian);
+			}
+		}
+
+		public virtual void BulkPeekUint(Range<long> addresses, bool bigEndian, uint[] values)
+		{
+			if (addresses == null || values == null)
+			{
+				throw new ArgumentException();
+			}
+
+			if (addresses.EndInclusive - addresses.Start != values.Length)
+			{
+				throw new InvalidOperationException("Invalid length of values array");
+			}
+
+			for (var i = addresses.Start; i < addresses.EndInclusive; i++)
+			{
+				values[i] = PeekUint(i, bigEndian);
+			}
+		}
 	}
 }
diff --git a/BizHawk.Emulation.Common/Base Implementations/MemoryDomainImpls.cs b/BizHawk.Emulation.Common/Base Implementations/MemoryDomainImpls.cs
index d7f0f22453..c84ed1f408 100644
--- a/BizHawk.Emulation.Common/Base Implementations/MemoryDomainImpls.cs	
+++ b/BizHawk.Emulation.Common/Base Implementations/MemoryDomainImpls.cs	
@@ -1,5 +1,6 @@
 using BizHawk.Common;
 using System;
+using System.Collections.Generic;
 
 namespace BizHawk.Emulation.Common
 {
@@ -7,6 +8,11 @@ namespace BizHawk.Emulation.Common
 	{
 		private Action<long, byte> _poke;
 
+		// TODO: use an array of Ranges
+		private Action<Range<long>, byte[]> _bulkPeekByte { get; set; }
+		private Action<Range<long>, bool, ushort[]> _bulkPeekUshort { get; set; }
+		private Action<Range<long>, bool, uint[]> _bulkPeekUint { get; set; }
+
 		public Func<long, byte> Peek { get; set; }
 
 		public Action<long, byte> Poke
@@ -29,7 +35,52 @@ namespace BizHawk.Emulation.Common
 			_poke?.Invoke(addr, val);
 		}
 
-		public MemoryDomainDelegate(string name, long size, Endian endian, Func<long, byte> peek, Action<long, byte> poke, int wordSize)
+		public override void BulkPeekByte(Range<long> addresses, byte[] values)
+		{
+			if (_bulkPeekByte != null)
+			{
+				_bulkPeekByte.Invoke(addresses, values);
+			}
+			else
+			{
+				base.BulkPeekByte(addresses, values);
+			}
+		}
+
+		public override void BulkPeekUshort(Range<long> addresses, bool bigEndian, ushort[] values)
+		{
+			if (_bulkPeekUshort != null)
+			{
+				_bulkPeekUshort.Invoke(addresses, EndianType == Endian.Big, values);
+			}
+			else
+			{
+				base.BulkPeekUshort(addresses, EndianType == Endian.Big, values);
+			}
+		}
+
+		public override void BulkPeekUint(Range<long> addresses, bool bigEndian, uint[] values)
+		{
+			if (_bulkPeekUint != null)
+			{
+				_bulkPeekUint.Invoke(addresses, EndianType == Endian.Big, values);
+			}
+			else
+			{
+				base.BulkPeekUint(addresses, EndianType == Endian.Big, values);
+			}
+		}
+
+		public MemoryDomainDelegate(
+			string name,
+			long size,
+			Endian endian,
+			Func<long, byte> peek,
+			Action<long, byte> poke,
+			int wordSize,
+			Action<Range<long>, byte[]> bulkPeekByte = null,
+			Action<Range<long>, bool, ushort[]> bulkPeekUshort = null,
+			Action<Range<long>, bool, uint[]> bulkPeekUint = null)
 		{
 			Name = name;
 			EndianType = endian;
@@ -38,6 +89,9 @@ namespace BizHawk.Emulation.Common
 			_poke = poke;
 			Writable = poke != null;
 			WordSize = wordSize;
+			_bulkPeekByte = bulkPeekByte;
+			_bulkPeekUshort = bulkPeekUshort;
+			_bulkPeekUint = bulkPeekUint;
 		}
 	}