diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index a94f34484d..c0d541ce80 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -33,6 +33,7 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/state"
+	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/eth"
 	"github.com/ethereum/go-ethereum/ethdb"
@@ -623,6 +624,8 @@ func MakeNode(ctx *cli.Context, name, gitCommit string) *node.Node {
 		WSOrigins:         ctx.GlobalString(WSAllowedOriginsFlag.Name),
 		WSModules:         MakeRPCModules(ctx.GlobalString(WSApiFlag.Name)),
 	}
+	vm.SetJITCacheSize(ctx.GlobalInt(VMCacheFlag.Name))
+
 	if ctx.GlobalBool(DevModeFlag.Name) {
 		if !ctx.GlobalIsSet(DataDirFlag.Name) {
 			config.DataDir = filepath.Join(os.TempDir(), "/ethereum_dev_mode")
diff --git a/core/blockchain.go b/core/blockchain.go
index 01aa987ddc..a05e8d104a 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -974,6 +974,12 @@ func (self *BlockChain) InsertChain(chain types.Blocks) (int, error) {
 		}
 
 		stats.processed++
+		if time.Since(bstart) > 1200*time.Millisecond {
+			glog.Infof("#### inserted slow block ####")
+			glog.Infof("[%v] inserted block #%d (%d TXs %v G %d UNCs) (%x...). Took %v\n", time.Now().UnixNano(), block.Number(), len(block.Transactions()), block.GasUsed(), len(block.Uncles()), block.Hash().Bytes()[0:4], time.Since(bstart))
+			glog.Infof("#############################")
+		}
+
 		if glog.V(logger.Info) {
 			stats.report(chain, i)
 		}