diff --git a/tests/vm/gh_test.go b/tests/vm/gh_test.go
index 2151cf9a5..a23076b74 100644
--- a/tests/vm/gh_test.go
+++ b/tests/vm/gh_test.go
@@ -79,10 +79,12 @@ func RunVmTest(p string, t *testing.T) {
 	helper.CreateFileTests(t, p, &tests)
 
 	for name, test := range tests {
-		helper.Logger.SetLogLevel(4)
-		if name != "TransactionNonceCheck2" {
-			continue
-		}
+		/*
+			helper.Logger.SetLogLevel(4)
+			if name != "log1_nonEmptyMem_logMemSize1_logMemStart31" {
+				continue
+			}
+		*/
 		db, _ := ethdb.NewMemDatabase()
 		statedb := state.New(nil, db)
 		for addr, account := range test.Pre {
@@ -159,10 +161,14 @@ func RunVmTest(p string, t *testing.T) {
 		}
 
 		if len(test.Logs) > 0 {
-			for i, log := range test.Logs {
-				genBloom := ethutil.LeftPadBytes(types.LogsBloom(state.Logs{logs[i]}).Bytes(), 64)
-				if !bytes.Equal(genBloom, ethutil.Hex2Bytes(log.BloomF)) {
-					t.Errorf("bloom mismatch")
+			if len(test.Logs) != len(logs) {
+				t.Errorf("log length mismatch. Expected %d, got %d", len(test.Logs), len(logs))
+			} else {
+				for i, log := range test.Logs {
+					genBloom := ethutil.LeftPadBytes(types.LogsBloom(state.Logs{logs[i]}).Bytes(), 64)
+					if !bytes.Equal(genBloom, ethutil.Hex2Bytes(log.BloomF)) {
+						t.Errorf("bloom mismatch")
+					}
 				}
 			}
 		}
@@ -176,11 +182,6 @@ func TestVMArithmetic(t *testing.T) {
 	RunVmTest(fn, t)
 }
 
-func TestSystemOperations(t *testing.T) {
-	const fn = "../files/VMTests/vmSystemOperationsTest.json"
-	RunVmTest(fn, t)
-}
-
 func TestBitwiseLogicOperation(t *testing.T) {
 	const fn = "../files/VMTests/vmBitwiseLogicOperationTest.json"
 	RunVmTest(fn, t)
@@ -201,6 +202,17 @@ func TestFlowOperation(t *testing.T) {
 	RunVmTest(fn, t)
 }
 
+func TestLogTest(t *testing.T) {
+	const fn = "../files/VMTests/vmLogTest.json"
+	RunVmTest(fn, t)
+}
+
+func TestPerformance(t *testing.T) {
+	t.Skip()
+	const fn = "../files/VMTests/vmPerformance.json"
+	RunVmTest(fn, t)
+}
+
 func TestPushDupSwap(t *testing.T) {
 	const fn = "../files/VMTests/vmPushDupSwapTest.json"
 	RunVmTest(fn, t)
diff --git a/vm/vm.go b/vm/vm.go
index 791718fb2..e3b7df329 100644
--- a/vm/vm.go
+++ b/vm/vm.go
@@ -34,7 +34,7 @@ func New(env Environment) *Vm {
 		lt = LogTyDiff
 	}
 
-	return &Vm{debug: false, env: env, logTy: lt, Recoverable: true}
+	return &Vm{debug: true, env: env, logTy: lt, Recoverable: true}
 }
 
 func (self *Vm) Run(me, caller ContextRef, code []byte, value, gas, price *big.Int, callData []byte) (ret []byte, err error) {
@@ -56,8 +56,6 @@ func (self *Vm) Run(me, caller ContextRef, code []byte, value, gas, price *big.I
 
 				err = fmt.Errorf("%v", r)
 
-			} else {
-				fmt.Println(me.(*state.StateObject).Storage())
 			}
 		}()
 	}
@@ -668,7 +666,6 @@ func (self *Vm) Run(me, caller ContextRef, code []byte, value, gas, price *big.I
 				}
 				addr = ref.Address()
 
-				fmt.Printf("CREATE %X\n", addr)
 				stack.Push(ethutil.BigD(addr))
 
 			}
@@ -860,6 +857,8 @@ func (self *Vm) calculateGasAndSize(context *Context, caller ContextRef, op OpCo
 
 	// Stack Check, memory resize & gas phase
 	switch op {
+	case PUSH1, PUSH2, PUSH3, PUSH4, PUSH5, PUSH6, PUSH7, PUSH8, PUSH9, PUSH10, PUSH11, PUSH12, PUSH13, PUSH14, PUSH15, PUSH16, PUSH17, PUSH18, PUSH19, PUSH20, PUSH21, PUSH22, PUSH23, PUSH24, PUSH25, PUSH26, PUSH27, PUSH28, PUSH29, PUSH30, PUSH31, PUSH32:
+		gas.Set(GasFastestStep)
 	case SWAP1, SWAP2, SWAP3, SWAP4, SWAP5, SWAP6, SWAP7, SWAP8, SWAP9, SWAP10, SWAP11, SWAP12, SWAP13, SWAP14, SWAP15, SWAP16:
 		n := int(op - SWAP1 + 2)
 		stack.require(n)
@@ -897,11 +896,12 @@ func (self *Vm) calculateGasAndSize(context *Context, caller ContextRef, op OpCo
 			g = GasStorageMod
 		}
 		gas.Set(g)
-		newMemSize = calcMemSize(stack.Peek(), u256(32))
 	case MLOAD:
 		newMemSize = calcMemSize(stack.Peek(), u256(32))
 	case MSTORE8:
 		newMemSize = calcMemSize(stack.Peek(), u256(1))
+	case MSTORE:
+		newMemSize = calcMemSize(stack.Peek(), u256(32))
 	case RETURN:
 		newMemSize = calcMemSize(stack.Peek(), stack.data[stack.Len()-2])
 	case SHA3: