diff --git a/consensus/validator.go b/consensus/validator.go
index c52b291ff..70d2c01d9 100644
--- a/consensus/validator.go
+++ b/consensus/validator.go
@@ -3,6 +3,7 @@ package consensus
 import (
 	"bytes"
 	"encoding/hex"
+	"sync"
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -58,30 +59,36 @@ func (consensus *Consensus) onAnnounce(msg *msg_pb.Message) {
 }
 
 func (consensus *Consensus) prepare() {
+	var wg sync.WaitGroup
+	wg.Add(len(consensus.PubKey.PublicKey))
 	groupID := []nodeconfig.GroupID{nodeconfig.NewGroupIDByShardID(nodeconfig.ShardID(consensus.ShardID))}
 	for i, key := range consensus.PubKey.PublicKey {
-		networkMessage, err := consensus.construct(msg_pb.MessageType_PREPARE, nil, key, consensus.priKey.PrivateKey[i])
-		if err != nil {
-			consensus.getLogger().Err(err).
-				Str("message-type", msg_pb.MessageType_PREPARE.String()).
-				Msg("could not construct message")
-			return
-		}
+		go func(i int) {
+			defer wg.Done()
+			networkMessage, err := consensus.construct(msg_pb.MessageType_PREPARE, nil, key, consensus.priKey.PrivateKey[i])
+			if err != nil {
+				consensus.getLogger().Err(err).
+					Str("message-type", msg_pb.MessageType_PREPARE.String()).
+					Msg("could not construct message")
+				return
+			}
 
-		// TODO: this will not return immediatey, may block
-		if consensus.current.Mode() != Listening {
-			if err := consensus.msgSender.SendWithoutRetry(
-				groupID,
-				p2p.ConstructMessage(networkMessage.Bytes),
-			); err != nil {
-				consensus.getLogger().Warn().Err(err).Msg("[OnAnnounce] Cannot send prepare message")
-			} else {
-				consensus.getLogger().Info().
-					Str("blockHash", hex.EncodeToString(consensus.blockHash[:])).
-					Msg("[OnAnnounce] Sent Prepare Message!!")
+			// TODO: this will not return immediatey, may block
+			if consensus.current.Mode() != Listening {
+				if err := consensus.msgSender.SendWithoutRetry(
+					groupID,
+					p2p.ConstructMessage(networkMessage.Bytes),
+				); err != nil {
+					consensus.getLogger().Warn().Err(err).Msg("[OnAnnounce] Cannot send prepare message")
+				} else {
+					consensus.getLogger().Info().
+						Str("blockHash", hex.EncodeToString(consensus.blockHash[:])).
+						Msg("[OnAnnounce] Sent Prepare Message!!")
+				}
 			}
-		}
+		}(i)
 	}
+	wg.Wait()
 	consensus.getLogger().Debug().
 		Str("From", consensus.phase.String()).
 		Str("To", FBFTPrepare.String()).
@@ -207,27 +214,33 @@ func (consensus *Consensus) onPrepared(msg *msg_pb.Message) {
 	groupID := []nodeconfig.GroupID{
 		nodeconfig.NewGroupIDByShardID(nodeconfig.ShardID(consensus.ShardID)),
 	}
+	var wg sync.WaitGroup
+	wg.Add(len(consensus.PubKey.PublicKey))
 	for i, key := range consensus.PubKey.PublicKey {
-		networkMessage, _ := consensus.construct(
-			msg_pb.MessageType_COMMIT,
-			commitPayload,
-			key, consensus.priKey.PrivateKey[i],
-		)
-
-		if consensus.current.Mode() != Listening {
-			if err := consensus.msgSender.SendWithoutRetry(
-				groupID,
-				p2p.ConstructMessage(networkMessage.Bytes),
-			); err != nil {
-				consensus.getLogger().Warn().Msg("[OnPrepared] Cannot send commit message!!")
-			} else {
-				consensus.getLogger().Info().
-					Uint64("blockNum", consensus.blockNum).
-					Hex("blockHash", consensus.blockHash[:]).
-					Msg("[OnPrepared] Sent Commit Message!!")
+		go func(i int) {
+			defer wg.Done()
+			networkMessage, _ := consensus.construct(
+				msg_pb.MessageType_COMMIT,
+				commitPayload,
+				key, consensus.priKey.PrivateKey[i],
+			)
+
+			if consensus.current.Mode() != Listening {
+				if err := consensus.msgSender.SendWithoutRetry(
+					groupID,
+					p2p.ConstructMessage(networkMessage.Bytes),
+				); err != nil {
+					consensus.getLogger().Warn().Msg("[OnPrepared] Cannot send commit message!!")
+				} else {
+					consensus.getLogger().Info().
+						Uint64("blockNum", consensus.blockNum).
+						Hex("blockHash", consensus.blockHash[:]).
+						Msg("[OnPrepared] Sent Commit Message!!")
+				}
 			}
-		}
+		}(i)
 	}
+	wg.Wait()
 	consensus.getLogger().Debug().
 		Str("From", consensus.phase.String()).
 		Str("To", FBFTCommit.String()).