diff --git a/core/tx_pool.go b/core/tx_pool.go
index bf977fc1a6..f274cd0c80 100644
--- a/core/tx_pool.go
+++ b/core/tx_pool.go
@@ -106,7 +106,8 @@ var (
 	queuedNofundsMeter   = metrics.NewRegisteredMeter("txpool/queued/nofunds", nil)   // Dropped due to out-of-funds
 
 	// General tx metrics
-	validMeter         = metrics.NewRegisteredMeter("txpool/valid", nil)
+	knownTxMeter       = metrics.NewRegisteredMeter("txpool/known", nil)
+	validTxMeter       = metrics.NewRegisteredMeter("txpool/valid", nil)
 	invalidTxMeter     = metrics.NewRegisteredMeter("txpool/invalid", nil)
 	underpricedTxMeter = metrics.NewRegisteredMeter("txpool/underpriced", nil)
 
@@ -659,21 +660,19 @@ func (pool *TxPool) add(tx *types.Transaction, local bool) (replaced bool, err e
 	hash := tx.Hash()
 	if pool.all.Get(hash) != nil {
 		log.Trace("Discarding already known transaction", "hash", hash)
+		knownTxMeter.Mark(1)
 		return false, fmt.Errorf("known transaction: %x", hash)
 	}
-
 	// If the transaction fails basic validation, discard it
 	if err := pool.validateTx(tx, local); err != nil {
 		log.Trace("Discarding invalid transaction", "hash", hash, "err", err)
 		invalidTxMeter.Mark(1)
 		return false, err
 	}
-
 	from, _ := types.Sender(pool.signer, tx) // already validated
 	if tx.IsSpecialTransaction() && pool.IsSigner != nil && pool.IsSigner(from) && pool.pendingNonces.get(from) == tx.Nonce() {
 		return pool.promoteSpecialTx(from, tx)
 	}
-
 	// If the transaction pool is full, discard underpriced transactions
 	if uint64(pool.all.Count()) >= pool.config.GlobalSlots+pool.config.GlobalQueue {
 		log.Debug("Add transaction to pool full", "hash", hash, "nonce", tx.Nonce())
@@ -691,7 +690,6 @@ func (pool *TxPool) add(tx *types.Transaction, local bool) (replaced bool, err e
 			pool.removeTx(tx.Hash(), false)
 		}
 	}
-
 	// Try to replace an existing transaction in the pending pool
 	if list := pool.pending[from]; list != nil && list.Overlaps(tx) {
 		// Nonce already pending, check if required price bump is met
@@ -713,13 +711,11 @@ func (pool *TxPool) add(tx *types.Transaction, local bool) (replaced bool, err e
 		log.Trace("Pooled new executable transaction", "hash", hash, "from", from, "to", tx.To())
 		return old != nil, nil
 	}
-
 	// New transaction isn't replacing a pending one, push into queue
 	replaced, err = pool.enqueueTx(hash, tx)
 	if err != nil {
 		return false, err
 	}
-
 	// Mark local addresses and journal local transactions
 	if local {
 		if !pool.locals.contains(from) {
@@ -905,11 +901,18 @@ func (pool *TxPool) AddRemote(tx *types.Transaction) error {
 
 // addTxs attempts to queue a batch of transactions if they are valid.
 func (pool *TxPool) addTxs(txs []*types.Transaction, local, sync bool) []error {
+	// Filter out known ones without obtaining the pool lock or recovering signatures
+	for i := 0; i < len(txs); i++ {
+		if pool.all.Get(txs[i].Hash()) != nil {
+			knownTxMeter.Mark(1)
+			txs = append(txs[:i], txs[i+1:]...)
+			i--
+		}
+	}
 	// Cache senders in transactions before obtaining lock (pool.signer is immutable)
 	for _, tx := range txs {
 		types.Sender(pool.signer, tx)
 	}
-
 	pool.mu.Lock()
 	errs, dirtyAddrs := pool.addTxsLocked(txs, local)
 	pool.mu.Unlock()
@@ -933,7 +936,7 @@ func (pool *TxPool) addTxsLocked(txs []*types.Transaction, local bool) ([]error,
 			dirty.addTx(tx)
 		}
 	}
-	validMeter.Mark(int64(len(dirty.accounts)))
+	validTxMeter.Mark(int64(len(dirty.accounts)))
 	return errs, dirty
 }