diff --git a/CommonAssemblyInfo.cs.in b/CommonAssemblyInfo.cs.in
index 8d08dc8d7..af47d23ac 100644
--- a/CommonAssemblyInfo.cs.in
+++ b/CommonAssemblyInfo.cs.in
@@ -29,7 +29,7 @@ using System.Reflection;
 [assembly: AssemblyCopyright("Copyright (C) 2019 Jessie Lesbian (based on work by Jeroen Frijters and Windward Studios)")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
-[assembly: AssemblyVersion("8.6.3.0")]
+[assembly: AssemblyVersion("8.6.4.0")]
 
 #if SIGNCODE
 	#pragma warning disable 1699
diff --git a/openjdk/commonAttributes.class b/openjdk/commonAttributes.class
index 3eae29574..71bfe54ff 100644
Binary files a/openjdk/commonAttributes.class and b/openjdk/commonAttributes.class differ
diff --git a/openjdk/java/lang/PropertyConstants.class b/openjdk/java/lang/PropertyConstants.class
index 648601b32..302c379e8 100644
Binary files a/openjdk/java/lang/PropertyConstants.class and b/openjdk/java/lang/PropertyConstants.class differ
diff --git a/runtime/ByteCodeHelper.cs b/runtime/ByteCodeHelper.cs
index ed23a7790..21b9b240b 100644
--- a/runtime/ByteCodeHelper.cs
+++ b/runtime/ByteCodeHelper.cs
@@ -27,6 +27,7 @@ Jeroen Frijters
 using System.Threading;
 using IKVM.Attributes;
 using IKVM.Internal;
+using System.Collections.Generic;
 using System.Runtime.InteropServices;
 
 namespace IKVM.Runtime
@@ -189,7 +190,7 @@ public static void DynamicAastore(object arrayref, int index, object val)
 		{
 #if !FIRST_PASS
 			Profiler.Count("DynamicAastore");
-			((Array)arrayref).SetValue(val, index);
+			((IList<object>)arrayref)[index] = val;
 #endif
 		}
 
@@ -200,7 +201,7 @@ public static object DynamicAaload(object arrayref, int index)
 			return null;
 #else
 			Profiler.Count("DynamicAaload");
-			return ((Array)arrayref).GetValue(index);
+			return ((IList<object>)arrayref)[index];
 #endif
 		}
 
diff --git a/runtime/compiler.cs b/runtime/compiler.cs
index ecbce28d9..0da0fe78f 100644
--- a/runtime/compiler.cs
+++ b/runtime/compiler.cs
@@ -2069,8 +2069,12 @@ private void Compile(Block block, int startIndex)
 					TypeWrapper tw = ma.GetRawStackTypeWrapper(i, 1);
 					if(tw.IsUnloadable)
 					{
+						#if STATIC_COMPILER
 						Profiler.Count("EmitDynamicAaload");
 						ilGenerator.Emit(OpCodes.Call, ByteCodeHelperMethods.DynamicAaload);
+						#else
+						ilGenerator.Emit(OpCodes.Callvirt, Helper.ArrayLoad);
+						#endif
 					}
 					else
 					{
@@ -2141,8 +2145,12 @@ private void Compile(Block block, int startIndex)
 					TypeWrapper tw = ma.GetRawStackTypeWrapper(i, 2);
 					if(tw.IsUnloadable)
 					{
+						#if STATIC_COMPILER
 						Profiler.Count("EmitDynamicAastore");
 						ilGenerator.Emit(OpCodes.Call, ByteCodeHelperMethods.DynamicAastore);
+						#else
+						ilGenerator.Emit(OpCodes.Callvirt, Helper.ArrayLoad);
+						#endif
 					}
 					else
 					{
diff --git a/runtime/jessielesbian.cs b/runtime/jessielesbian.cs
index 77c2fe506..838795d1c 100644
--- a/runtime/jessielesbian.cs
+++ b/runtime/jessielesbian.cs
@@ -1,6 +1,8 @@
 using System;
-using System.Collections.Generic;
+using IKVM.Internal;
+using System.Reflection;
 using Instruction = IKVM.Internal.ClassFile.Method.Instruction;
+using System.Collections.Generic;
 
 //Do you believe in high-quality code by Female/LGBT programmers? Leave u/jessielesbian a PM on Reddit!
 
@@ -8,13 +10,18 @@ namespace jessielesbian.IKVM
 {
     public static class Helper
     {
+        static Helper()
+        {
+            Array array = new object[0];
+            ArrayLoad = new Func<int, object>(array.GetValue).Method;
+            ArrayStore = new Action<object, int>(array.SetValue).Method;
+        }
         public static int optpasses = 0;
         public static bool enableJITPreOptimization = false;
         internal static bool experimentalOptimizations
         {
             get
             {
-                
                 return (optpasses > 0);
             }
         }
@@ -122,14 +129,6 @@ internal static Instruction[] Optimize(Instruction[] instructions)
 
             instructions = (Instruction[])instructions.Clone();
             int optimizations = 1279738452;
-            List<int> brtargets = new List<int>(instructions.Length);
-            for (int i = 1; i < instructions.Length; i++)
-            {
-                if (IsBranchInstruction(instructions[i]))
-                {
-                    brtargets.Add(i);
-                }
-            }
             while (optimizations != 0)
             {
                 optimizations = 0;
@@ -140,21 +139,9 @@ internal static Instruction[] Optimize(Instruction[] instructions)
                     {
                         prevIndex--;
                     }
-                    if (brtargets.Contains(prevIndex) || IsBranchInstruction(instructions[prevIndex]))
-                    {
-                        continue;
-                    }
                     Instruction current = instructions[i];
                     Instruction prev = instructions[i - 1];
-                    if (brtargets.Contains(i))
-                    {
-                        continue;
-                    }
-                    if (brtargets.Contains(i - 1))
-                    {
-                        continue;
-                    }
-                    if (brtargets.Contains(i + 1))
+                    if (IsBranchInstruction(current) || IsBranchInstruction(prev))
                     {
                         continue;
                     }
@@ -311,7 +298,7 @@ internal static Instruction[] Optimize(Instruction[] instructions)
                             optimizations = optimizations + 1;
                         }
                     }
-                    //peephole optimization: remove unnecessary swaps
+                    //peephole optimization: remove unnecessary swaps + branch optimizations
                     if (prev.NormalizedOpCode == NormalizedByteCode.__swap)
                     {
                         switch (current.NormalizedOpCode)
@@ -353,41 +340,17 @@ internal static Instruction[] Optimize(Instruction[] instructions)
                                 break;
                         }
                     }
-                    //branch optimizations
-                    if(prev.NormalizedOpCode == NormalizedByteCode.__aconst_null)
-                    {
-                        if(current.NormalizedOpCode == NormalizedByteCode.__ifnull)
-                        {
-                            prev = GetInstuction(NormalizedByteCode.__nop);
-                            current.PatchOpCode(NormalizedByteCode.__goto);
-                            optimizations = optimizations + 1;
-                        }
-                        else if (current.NormalizedOpCode == NormalizedByteCode.__ifnonnull)
-                        {
-                            prev = GetInstuction(NormalizedByteCode.__nop);
-                            current = prev;
-                            optimizations = optimizations + 1;
-                        }
-                    }
-                    if(IsBranchInstruction(current))
-                    {
-                        Instruction target = instructions[current.TargetIndex];
-                        if (target.NormalizedOpCode == NormalizedByteCode.__goto)
-                        {
-                            current.TargetIndex = target.TargetIndex;
-                            optimizations = optimizations + 1;
-                        }
-                        else if(target.NormalizedOpCode == NormalizedByteCode.__nop)
-                        {
-                            current.TargetIndex++;
-                            optimizations = optimizations + 1;
-                        }
-                    }
                     instructions[i] = current;
                     instructions[i - 1] = prev;
                 }
             }
             return instructions;
         }
+        internal static readonly MethodInfo ArrayLoad;
+        internal static readonly MethodInfo ArrayStore; 
+        public static object aaload(Array array, int index)
+        {
+            return array.GetValue(index);
+        }
     }
 }
\ No newline at end of file
diff --git a/runtime/vm.cs b/runtime/vm.cs
index a98cd7cfb..bd4212fb2 100644
--- a/runtime/vm.cs
+++ b/runtime/vm.cs
@@ -35,6 +35,7 @@ Jeroen Frijters
 using System.Security;
 using System.Security.Permissions;
 using IKVM.Internal;
+using System.Collections.Generic;
 
 #if !STATIC_COMPILER && !STUB_GENERATOR
 namespace IKVM.Internal