diff --git a/mux.go b/mux.go
index 42e5a586..9bae0fc7 100644
--- a/mux.go
+++ b/mux.go
@@ -2,6 +2,7 @@ package rueidis
 
 import (
 	"context"
+	"math/rand"
 	"net"
 	"runtime"
 	"sync"
@@ -223,7 +224,7 @@ func (m *mux) blockingMulti(ctx context.Context, cmd []Completed) (resp *redisre
 }
 
 func (m *mux) pipeline(ctx context.Context, cmd Completed) (resp RedisResult) {
-	slot := cmd.Slot() & uint16(len(m.wire)-1)
+	slot := uint16(fastrand(len(m.wire)))
 	wire := m.pipe(slot)
 	if resp = wire.Do(ctx, cmd); isBroken(resp.NonRedisError(), wire) {
 		m.wire[slot].CompareAndSwap(wire, m.init)
@@ -232,7 +233,7 @@ func (m *mux) pipeline(ctx context.Context, cmd Completed) (resp RedisResult) {
 }
 
 func (m *mux) pipelineMulti(ctx context.Context, cmd []Completed) (resp *redisresults) {
-	slot := cmd[0].Slot() & uint16(len(m.wire)-1)
+	slot := uint16(fastrand(len(m.wire)))
 	wire := m.pipe(slot)
 	resp = wire.DoMulti(ctx, cmd...)
 	for _, r := range resp.s {
@@ -346,3 +347,16 @@ func (m *mux) Addr() string {
 func isBroken(err error, w wire) bool {
 	return err != nil && err != ErrClosing && w.Error() != nil
 }
+
+var rngPool = sync.Pool{
+	New: func() any {
+		return rand.New(rand.NewSource(time.Now().UnixNano()))
+	},
+}
+
+func fastrand(n int) (r int) {
+	s := rngPool.Get().(*rand.Rand)
+	r = s.Intn(n)
+	rngPool.Put(s)
+	return
+}
diff --git a/redis_test.go b/redis_test.go
index 576e4a57..0df59187 100644
--- a/redis_test.go
+++ b/redis_test.go
@@ -18,10 +18,13 @@ func parallel(p int) (chan func(), func()) {
 	wg.Add(p)
 	for i := 0; i < p; i++ {
 		go func() {
+			defer func() {
+				recover()
+				wg.Done()
+			}()
 			for fn := range ch {
 				fn()
 			}
-			wg.Done()
 		}()
 	}
 	return ch, func() {
@@ -120,7 +123,7 @@ func testSETGET(t *testing.T, client Client, csc bool) {
 		jobs <- func() {
 			val, err := client.Do(ctx, client.B().Set().Key(key).Value(kvs[key]).Build()).ToString()
 			if err != nil || val != "OK" {
-				t.Fatalf("unexpected set response %v %v", val, err)
+				t.Errorf("unexpected set response %v %v", val, err)
 			}
 		}
 	}
@@ -133,7 +136,7 @@ func testSETGET(t *testing.T, client Client, csc bool) {
 		jobs <- func() {
 			val, err := client.Do(ctx, client.B().Get().Key(key).Build()).ToString()
 			if v, ok := kvs[key]; !((ok && val == v) || (!ok && IsRedisNil(err))) {
-				t.Fatalf("unexpected get response %v %v %v", val, err, ok)
+				t.Errorf("unexpected get response %v %v %v", val, err, ok)
 			}
 		}
 	}
@@ -148,7 +151,7 @@ func testSETGET(t *testing.T, client Client, csc bool) {
 			resp := client.DoCache(ctx, client.B().Get().Key(key).Cache(), time.Minute)
 			val, err := resp.ToString()
 			if v, ok := kvs[key]; !((ok && val == v) || (!ok && IsRedisNil(err))) {
-				t.Fatalf("unexpected csc get response %v %v %v", val, err, ok)
+				t.Errorf("unexpected csc get response %v %v %v", val, err, ok)
 			}
 			if resp.IsCacheHit() {
 				atomic.AddInt64(&hits, 1)
@@ -175,12 +178,14 @@ func testSETGET(t *testing.T, client Client, csc bool) {
 		jobs <- func() {
 			val, err := client.Do(ctx, client.B().Del().Key(key).Build()).AsInt64()
 			if _, ok := kvs[key]; !((val == 1 && ok) || (val == 0 && !ok)) {
-				t.Fatalf("unexpected del response %v %v %v", val, err, ok)
+				t.Errorf("unexpected del response %v %v %v", val, err, ok)
 			}
 		}
 	}
 	wait()
 
+	time.Sleep(time.Second)
+
 	t.Logf("testing client side caching after delete\n")
 	jobs, wait = parallel(para)
 	for i := 0; i < keys/100; i++ {
@@ -188,10 +193,10 @@ func testSETGET(t *testing.T, client Client, csc bool) {
 		jobs <- func() {
 			resp := client.DoCache(ctx, client.B().Get().Key(key).Cache(), time.Minute)
 			if !IsRedisNil(resp.Error()) {
-				t.Fatalf("unexpected csc get response after delete %v", resp)
+				t.Errorf("unexpected csc get response after delete %v", resp)
 			}
 			if resp.IsCacheHit() {
-				t.Fatalf("unexpected csc cache hit after delete")
+				t.Errorf("unexpected csc cache hit after delete")
 			}
 		}
 	}
@@ -320,6 +325,8 @@ func testMultiSETGET(t *testing.T, client Client, csc bool) {
 	}
 	wait()
 
+	time.Sleep(time.Second)
+
 	t.Logf("testing client side caching after delete\n")
 	jobs, wait = parallel(para)
 	for i := 0; i < keys/100; i += batch {
@@ -415,7 +422,9 @@ func testMultiSETGETHelpers(t *testing.T, client Client, csc bool) {
 			t.Fatalf("unexpecetd err %v\n", err)
 		}
 	}
+
 	time.Sleep(time.Second)
+
 	t.Logf("testing client side caching after delete\n")
 	resp, err = MGetCache(client, ctx, time.Minute, cmdKeys)
 	if err != nil {
diff --git a/rueidis.go b/rueidis.go
index e5c29f05..7cb1d3c6 100644
--- a/rueidis.go
+++ b/rueidis.go
@@ -5,8 +5,10 @@ import (
 	"context"
 	"crypto/tls"
 	"errors"
+	"math"
 	"math/rand"
 	"net"
+	"runtime"
 	"strings"
 	"time"
 
@@ -319,7 +321,9 @@ func NewClient(option ClientOption) (client Client, err error) {
 
 func singleClientMultiplex(multiplex int) int {
 	if multiplex == 0 {
-		multiplex = 2
+		if multiplex = int(math.Log2(float64(runtime.GOMAXPROCS(0)))); multiplex >= 2 {
+			multiplex = 2
+		}
 	}
 	if multiplex < 0 {
 		multiplex = 0