diff --git a/src/Benchmarks/Arch/X86/X86DisassemblerBenchmarks.cs b/src/Benchmarks/Arch/X86/X86DisassemblerBenchmarks.cs
new file mode 100644
index 0000000000..533e2d1bba
--- /dev/null
+++ b/src/Benchmarks/Arch/X86/X86DisassemblerBenchmarks.cs
@@ -0,0 +1,48 @@
+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Configs;
+using BenchmarkDotNet.Diagnosers;
+using Reko.Arch.X86;
+using Reko.Core;
+using Reko.Core.Memory;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.Design;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Reko.Benchmarks.Arch.X86
+{
+    [Config(typeof(Config))]
+    public class X86DisassemblerBenchmarks
+    {
+        private readonly ByteMemoryArea machineCode;
+        private readonly X86ArchitectureFlat32 arch;
+
+        public X86DisassemblerBenchmarks()
+        {
+            var mem = new byte[4096];
+            var rnd = new Random(0x142621A2);
+            rnd.NextBytes(mem);
+            this.machineCode = new ByteMemoryArea(Address.Ptr32(0x10000), mem);
+            this.arch = new X86ArchitectureFlat32(new ServiceContainer(), "x86-protected-32", new());
+        }
+
+        [Benchmark]
+        public void DisassembleBytes()
+        {
+            var rdr = arch.CreateImageReader(machineCode, 0);
+            var dasm = arch.CreateDisassembler(rdr);
+            foreach (var instr in dasm)
+                ;
+        }
+
+        public class Config : ManualConfig
+        {
+            public Config()
+            {
+                AddDiagnoser(MemoryDiagnoser.Default);
+            }
+        }
+    }
+}
diff --git a/src/Benchmarks/Arch/X86/X86RewriterBenchmarks.cs b/src/Benchmarks/Arch/X86/X86RewriterBenchmarks.cs
new file mode 100644
index 0000000000..5b658838a3
--- /dev/null
+++ b/src/Benchmarks/Arch/X86/X86RewriterBenchmarks.cs
@@ -0,0 +1,51 @@
+using BenchmarkDotNet.Attributes;
+using Reko.Arch.X86;
+using Reko.Core.Memory;
+using Reko.Core;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.Design;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using BenchmarkDotNet.Configs;
+using BenchmarkDotNet.Diagnosers;
+using System.Reflection;
+
+namespace Reko.Benchmarks.Arch.X86
+{
+    [Config(typeof(Config))]
+    public class X86RewriterBenchmarks
+    {
+        private readonly ByteMemoryArea machineCode;
+        private readonly X86ArchitectureFlat32 arch;
+
+        public X86RewriterBenchmarks()
+        {
+            var mem = new byte[4096];
+            var rnd = new Random(0x142621A2);
+            rnd.NextBytes(mem);
+            this.machineCode = new ByteMemoryArea(Address.Ptr32(0x10000), mem);
+            this.arch = new X86ArchitectureFlat32(new ServiceContainer(), "x86-protected-32", new());
+        }
+
+        [Benchmark]
+        public void LiftMachineCode()
+        {
+            var rdr = arch.CreateImageReader(machineCode, 0);
+            var rw = arch.CreateRewriter(rdr, arch.CreateProcessorState(), new StorageBinder(), new NullRewriterHost());
+            foreach (var rtlc in rw)
+                ;
+        }
+
+        public class Config : ManualConfig
+        {
+            public Config()
+            {
+                AddDiagnoser(MemoryDiagnoser.Default);
+            }
+        }
+
+
+    }
+}
diff --git a/subjects/regression.log b/subjects/regression.log
index 01eb15d179..beb8e1a50c 100644
--- a/subjects/regression.log
+++ b/subjects/regression.log
@@ -1327,7 +1327,8 @@ finish: error: An error occurred while renaming variables.
        at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
    at Reko.Analysis.SsaLivenessAnalysis.LiveOutAtBlock(Block b, SsaIdentifier v) in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\SsaLiveness.cs:line 170
    at Reko.Analysis.SsaLivenessAnalysis.BuildInterferenceGraph(SsaIdentifierCollection ssaIds) in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\SsaLiveness.cs:line 100
-   at Reko.Analysis.LiveCopyInserter..ctor(SsaState ssa) in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\LiveCopyInserter.cs:line 43
+   at Reko.Analysis.SsaLivenessAnalysis..ctor(SsaState ssa) in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\SsaLiveness.cs:line 62
+   at Reko.Analysis.LiveCopyInserter..ctor(SsaState ssa) in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\LiveCopyInserter.cs:line 41
    at Reko.Analysis.WebBuilder.Worker.Transform() in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\WebBuilder.cs:line 136
 l00401628: warning: Non-integral switch expression
 l00401614: warning: Non-integral switch expression
@@ -1428,7 +1429,6 @@ fn0800_1CF6: error: An error occurred while renaming variables.
     The given key 'l0800_1D54' was not present in the dictionary.
        at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
    at Reko.Analysis.SsaLivenessAnalysis.IsLiveIn(Identifier id, Statement stm) in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\SsaLiveness.cs:line 129
-   at Reko.Analysis.LiveCopyInserter.IsLiveAtCopyPoint(Identifier id, Block b) in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\LiveCopyInserter.cs:line 91
    at Reko.Analysis.LiveCopyInserter.Transform(Statement stm, PhiAssignment phi) in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\LiveCopyInserter.cs:line 119
    at Reko.Analysis.LiveCopyInserter.Transform() in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\LiveCopyInserter.cs:line 106
    at Reko.Analysis.WebBuilder.Worker.Transform() in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\WebBuilder.cs:line 136
@@ -1436,7 +1436,6 @@ fn0800_67BF: error: An error occurred while renaming variables.
     The given key 'l0800_6A7C' was not present in the dictionary.
        at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
    at Reko.Analysis.SsaLivenessAnalysis.IsLiveIn(Identifier id, Statement stm) in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\SsaLiveness.cs:line 129
-   at Reko.Analysis.LiveCopyInserter.IsLiveAtCopyPoint(Identifier id, Block b) in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\LiveCopyInserter.cs:line 91
    at Reko.Analysis.LiveCopyInserter.Transform(Statement stm, PhiAssignment phi) in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\LiveCopyInserter.cs:line 119
    at Reko.Analysis.LiveCopyInserter.Transform() in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\LiveCopyInserter.cs:line 106
    at Reko.Analysis.WebBuilder.Worker.Transform() in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\WebBuilder.cs:line 136
@@ -1444,7 +1443,6 @@ fn0800_4F2C: error: An error occurred while renaming variables.
     The given key 'l0800_4F67' was not present in the dictionary.
        at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
    at Reko.Analysis.SsaLivenessAnalysis.IsLiveIn(Identifier id, Statement stm) in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\SsaLiveness.cs:line 129
-   at Reko.Analysis.LiveCopyInserter.IsLiveAtCopyPoint(Identifier id, Block b) in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\LiveCopyInserter.cs:line 91
    at Reko.Analysis.LiveCopyInserter.Transform(Statement stm, PhiAssignment phi) in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\LiveCopyInserter.cs:line 119
    at Reko.Analysis.LiveCopyInserter.Transform() in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\LiveCopyInserter.cs:line 106
    at Reko.Analysis.WebBuilder.Worker.Transform() in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\WebBuilder.cs:line 136
@@ -1452,7 +1450,6 @@ fn0800_C177: error: An error occurred while renaming variables.
     The given key 'l0800_C22D' was not present in the dictionary.
        at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
    at Reko.Analysis.SsaLivenessAnalysis.IsLiveIn(Identifier id, Statement stm) in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\SsaLiveness.cs:line 129
-   at Reko.Analysis.LiveCopyInserter.IsLiveAtCopyPoint(Identifier id, Block b) in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\LiveCopyInserter.cs:line 91
    at Reko.Analysis.LiveCopyInserter.Transform(Statement stm, PhiAssignment phi) in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\LiveCopyInserter.cs:line 119
    at Reko.Analysis.LiveCopyInserter.Transform() in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\LiveCopyInserter.cs:line 106
    at Reko.Analysis.WebBuilder.Worker.Transform() in c:\dev\uxmal\reko\master\src\Decompiler\Analysis\WebBuilder.cs:line 136
@@ -2399,4 +2396,4 @@ PE Debug type 14 not supported yet.
 === PE\x86\VCExeSample\VCExeSample
 Signature of 'Microsoft Visual C++ 8' detected.
 
-Decompiled 96 binaries in 47.93 seconds.
+Decompiled 96 binaries in 58.97 seconds.