diff --git a/node/transaction.go b/node/transaction.go
index 2784d6e63..e426a9572 100644
--- a/node/transaction.go
+++ b/node/transaction.go
@@ -528,7 +528,7 @@ func (localNode *LocalNode) requestSignatureChainTransaction(neighbor *RemoteNod
 		return nil, err
 	}
 
-	porPkg, err := por.NewPorPackage(txn, false)
+	porPkg, err := por.NewPorPackage(txn)
 	if err != nil {
 		return nil, fmt.Errorf("create por package from txn error: %v", err)
 	}
diff --git a/por/minercache.go b/por/minercache.go
index 34c6dde70..eb5470fd6 100644
--- a/por/minercache.go
+++ b/por/minercache.go
@@ -3,7 +3,6 @@ package por
 import (
 	"sort"
 	"sync"
-	"time"
 
 	"github.com/nknorg/nkn/v2/common"
 	"github.com/nknorg/nkn/v2/config"
@@ -21,8 +20,8 @@ type RecentMiner map[string]int
 type SkipMiner [][]byte
 
 func init() {
-	recentMinerCache = common.NewGoCache(5*time.Minute, time.Minute)
-	skipMinerCache = common.NewGoCache(5*time.Minute, time.Minute)
+	recentMinerCache = common.NewGoCache(10*config.ConsensusDuration, config.ConsensusDuration)
+	skipMinerCache = common.NewGoCache(10*config.ConsensusDuration, config.ConsensusDuration)
 }
 
 func GetRecentMiner(blockHash []byte) (RecentMiner, error) {
diff --git a/por/porpackage.go b/por/porpackage.go
index 2681030a4..15248a44d 100644
--- a/por/porpackage.go
+++ b/por/porpackage.go
@@ -54,7 +54,7 @@ func (c PorPackages) Less(i, j int) bool {
 	return false
 }
 
-func NewPorPackage(txn *transaction.Transaction, shouldVerify bool) (*PorPackage, error) {
+func NewPorPackage(txn *transaction.Transaction) (*PorPackage, error) {
 	if txn.UnsignedTx.Payload.Type != pb.PayloadType_SIG_CHAIN_TXN_TYPE {
 		return nil, errors.New("Transaction type should be sigchain")
 	}
@@ -96,16 +96,9 @@ func NewPorPackage(txn *transaction.Transaction, shouldVerify bool) (*PorPackage
 		return nil, err
 	}
 
-	if shouldVerify {
-		err = VerifyID(sigChain, height)
-		if err != nil {
-			return nil, err
-		}
-
-		err = VerifySigChain(sigChain, height)
-		if err != nil {
-			return nil, err
-		}
+	err = VerifySigChainLight(sigChain, height)
+	if err != nil {
+		return nil, err
 	}
 
 	txHash := txn.Hash()
diff --git a/por/porserver.go b/por/porserver.go
index c35c90a6a..99b0c365e 100644
--- a/por/porserver.go
+++ b/por/porserver.go
@@ -411,7 +411,7 @@ func VerifyID(sc *pb.SigChain, height uint32) error {
 }
 
 func (ps *PorServer) AddSigChainFromTx(txn *transaction.Transaction, currentHeight uint32) (*PorPackage, error) {
-	porPkg, err := NewPorPackage(txn, false)
+	porPkg, err := NewPorPackage(txn)
 	if err != nil {
 		return nil, err
 	}
@@ -428,7 +428,7 @@ func (ps *PorServer) AddSigChainFromTx(txn *transaction.Transaction, currentHeig
 		return nil, err
 	}
 
-	err = VerifySigChain(porPkg.SigChain, porPkg.Height)
+	err = VerifySigChainSignatures(porPkg.SigChain)
 	if err != nil {
 		return nil, err
 	}
diff --git a/por/sigchain.go b/por/sigchain.go
index a913a181f..8882e1bfc 100644
--- a/por/sigchain.go
+++ b/por/sigchain.go
@@ -15,7 +15,9 @@ import (
 	"github.com/nknorg/nnet/overlay/chord"
 )
 
-func VerifySigChain(sc *pb.SigChain, height uint32) error {
+// VerifySigChainLight performs light-weighted sigchain verification without
+// verifying signature (CPU intensive) and ID (IO intensive).
+func VerifySigChainLight(sc *pb.SigChain, height uint32) error {
 	if err := VerifySigChainMeta(sc, height); err != nil {
 		return err
 	}
@@ -24,10 +26,6 @@ func VerifySigChain(sc *pb.SigChain, height uint32) error {
 		return err
 	}
 
-	if err := VerifySigChainSignatures(sc); err != nil {
-		return err
-	}
-
 	return nil
 }