diff --git a/k8s/transactor.go b/k8s/transactor.go
index a3a532a9..7c013b74 100644
--- a/k8s/transactor.go
+++ b/k8s/transactor.go
@@ -18,39 +18,51 @@ package k8s
 
 import (
 	"context"
-	"errors"
 	"math/big"
 	"time"
 
-	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
 
+	"github.com/getamis/istanbul-tools/client"
 	istcommon "github.com/getamis/istanbul-tools/common"
 )
 
 type Transactor interface {
-	SendTransactions(context.Context, common.Address, *big.Int, time.Duration) error
+	SendTransactions(*client.Client, *big.Int, time.Duration) error
 }
 
-func (eth *ethereum) SendTransactions(ctx context.Context, to common.Address, amount *big.Int, duration time.Duration) error {
-	client := eth.NewClient()
-	if client == nil {
-		return errors.New("failed to retrieve client")
-	}
+func (eth *ethereum) SendTransactions(client *client.Client, amount *big.Int, duration time.Duration) error {
+	var fns []func() error
+	for i, key := range eth.accounts {
+		i := i
+		key := key
 
-	nonce, err := client.NonceAt(context.Background(), eth.Address(), nil)
-	if err != nil {
-		log.Error("Failed to get nonce", "addr", eth.Address(), "err", err)
-		return err
-	}
+		fn := func() error {
+			fromAddr := crypto.PubkeyToAddress(key.PublicKey)
+			toAddr := crypto.PubkeyToAddress(eth.accounts[(i+1)%len(eth.accounts)].PublicKey)
+			timeout := time.After(duration)
 
-	timeout := time.After(duration)
-	for {
-		select {
-		case <-timeout:
-			return nil
-		default:
-			_ = istcommon.SendEther(client, eth.key, to, amount, nonce)
-			nonce++
+			nonce, err := client.NonceAt(context.Background(), fromAddr, nil)
+			if err != nil {
+				log.Error("Failed to get nonce", "addr", fromAddr, "err", err)
+				return err
+			}
+
+			for {
+				select {
+				case <-timeout:
+					return nil
+				default:
+					if err := istcommon.SendEther(client, key, toAddr, amount, nonce); err != nil {
+						return err
+					}
+					nonce++
+				}
+			}
 		}
+
+		fns = append(fns, fn)
 	}
+
+	return executeInParallel(fns...)
 }
diff --git a/tests/load/load_test.go b/tests/load/load_test.go
index d17f4c8a..b50a0d47 100644
--- a/tests/load/load_test.go
+++ b/tests/load/load_test.go
@@ -17,7 +17,6 @@
 package load
 
 import (
-	"context"
 	"math/big"
 	"sync"
 	"testing"
@@ -42,12 +41,10 @@ var _ = Describe("TPS-01: Large amount of transactions", func() {
 							runTests(numberOfValidators, gaslimit, txpoolSize)
 						},
 
-						tests.Case("2048", 2048),
 						tests.Case("10240", 10240),
 					)
 				},
 
-				tests.Case("21000*1000", 21000*1000),
 				tests.Case("21000*3000", 21000*3000),
 			)
 
@@ -63,12 +60,14 @@ func runTests(numberOfValidators int, gaslimit int, txpoolSize int) {
 			blockchain     container.Blockchain
 			sendEtherAddrs map[common.Address]common.Address
 
-			duration = 10 * time.Minute
+			duration        = 10 * time.Minute
+			accountsPerGeth = 30
 		)
 
 		BeforeEach(func() {
 			blockchain = k8s.NewBlockchain(
 				numberOfValidators,
+				accountsPerGeth,
 				uint64(gaslimit),
 				k8s.ImageRepository("quay.io/amis/geth"),
 				k8s.ImageTag("istanbul_develop"),
@@ -104,13 +103,13 @@ func runTests(numberOfValidators int, gaslimit int, txpoolSize int) {
 					transactor, ok := geth.(k8s.Transactor)
 					Expect(ok).To(BeTrue())
 
-					Expect(
-						transactor.SendTransactions(
-							context.Background(),
-							sendEtherAddrs[geth.Address()],
-							new(big.Int).Exp(big.NewInt(10), big.NewInt(3), nil),
-							duration),
-					).To(BeNil())
+					client := geth.NewClient()
+					Expect(client).NotTo(BeNil())
+
+					Expect(transactor.SendTransactions(
+						client,
+						new(big.Int).Exp(big.NewInt(10), big.NewInt(3), nil),
+						duration)).To(BeNil())
 
 					wg.Done()
 				})