diff --git a/stack_gvisor_udp.go b/stack_gvisor_udp.go
index f91a2b3..0c96213 100644
--- a/stack_gvisor_udp.go
+++ b/stack_gvisor_udp.go
@@ -38,7 +38,7 @@ func NewUDPForwarder(ctx context.Context, stack *stack.Stack, handler Handler, t
 		stack:   stack,
 		handler: handler,
 	}
-	forwarder.udpNat = udpnat.New(handler, forwarder.PreparePacketConnection, timeout, true)
+	forwarder.udpNat = udpnat.New(handler, forwarder.PreparePacketConnection, timeout, false)
 	return forwarder
 }
 
diff --git a/stack_mixed.go b/stack_mixed.go
index 8836d6b..4c0a203 100644
--- a/stack_mixed.go
+++ b/stack_mixed.go
@@ -130,7 +130,7 @@ func (m *Mixed) wintunLoop(winTun WinTun) {
 
 func (m *Mixed) batchLoopLinux(linuxTUN LinuxTUN, batchSize int) {
 	packetBuffers := make([][]byte, batchSize)
-	writeBuffers := make([][]byte, batchSize)
+	writeBuffers := make([][]byte, 0, batchSize)
 	packetSizes := make([]int, batchSize)
 	for i := range packetBuffers {
 		packetBuffers[i] = make([]byte, m.mtu+PacketOffset+m.frontHeadroom)
diff --git a/stack_system.go b/stack_system.go
index 031e87f..d834548 100644
--- a/stack_system.go
+++ b/stack_system.go
@@ -229,7 +229,7 @@ func (s *System) wintunLoop(winTun WinTun) {
 
 func (s *System) batchLoopLinux(linuxTUN LinuxTUN, batchSize int) {
 	packetBuffers := make([][]byte, batchSize)
-	writeBuffers := make([][]byte, batchSize)
+	writeBuffers := make([][]byte, 0, batchSize)
 	packetSizes := make([]int, batchSize)
 	for i := range packetBuffers {
 		packetBuffers[i] = make([]byte, s.mtu+s.frontHeadroom)
diff --git a/tun_darwin_gvisor.go b/tun_darwin_gvisor.go
index ef940c3..b506db4 100644
--- a/tun_darwin_gvisor.go
+++ b/tun_darwin_gvisor.go
@@ -43,12 +43,13 @@ func (t *NativeTun) WritePacket(pkt *stack.PacketBuffer) (int, error) {
 
 func (t *NativeTun) NewEndpoint() (stack.LinkEndpoint, stack.NICOptions, error) {
 	ep, err := fdbased.New(&fdbased.Options{
-		FDs:                 []int{t.tunFd},
-		MTU:                 t.options.MTU,
-		RXChecksumOffload:   true,
-		PacketDispatchMode:  fdbased.RecvMMsg,
-		MultiPendingPackets: t.options.EXP_MultiPendingPackets,
-		SendMsgX:            t.options.EXP_SendMsgX,
+		FDs:                  []int{t.tunFd},
+		MTU:                  t.options.MTU,
+		ProcessorsPerChannel: 1,
+		RXChecksumOffload:    true,
+		PacketDispatchMode:   fdbased.RecvMMsg,
+		MultiPendingPackets:  t.options.EXP_MultiPendingPackets,
+		SendMsgX:             t.options.EXP_SendMsgX,
 	})
 	if err != nil {
 		return nil, stack.NICOptions{}, err
diff --git a/tun_linux_gvisor.go b/tun_linux_gvisor.go
index 8adf4c5..ac4a76e 100644
--- a/tun_linux_gvisor.go
+++ b/tun_linux_gvisor.go
@@ -74,12 +74,13 @@ func (t *NativeTun) WritePacket(pkt *stack.PacketBuffer) (int, error) {
 func (t *NativeTun) NewEndpoint() (stack.LinkEndpoint, stack.NICOptions, error) {
 	if t.vnetHdr {
 		ep, err := fdbased.New(&fdbased.Options{
-			FDs:               []int{t.tunFd},
-			MTU:               t.options.MTU,
-			GSOMaxSize:        gsoMaxSize,
-			GRO:               true,
-			RXChecksumOffload: true,
-			TXChecksumOffload: t.txChecksumOffload,
+			FDs:                  []int{t.tunFd},
+			MTU:                  t.options.MTU,
+			ProcessorsPerChannel: 1,
+			GSOMaxSize:           gsoMaxSize,
+			GRO:                  true,
+			RXChecksumOffload:    true,
+			TXChecksumOffload:    t.txChecksumOffload,
 		})
 		if err != nil {
 			return nil, stack.NICOptions{}, err
@@ -87,10 +88,11 @@ func (t *NativeTun) NewEndpoint() (stack.LinkEndpoint, stack.NICOptions, error)
 		return ep, stack.NICOptions{}, nil
 	} else {
 		ep, err := fdbased.New(&fdbased.Options{
-			FDs:               []int{t.tunFd},
-			MTU:               t.options.MTU,
-			RXChecksumOffload: true,
-			TXChecksumOffload: t.txChecksumOffload,
+			FDs:                  []int{t.tunFd},
+			MTU:                  t.options.MTU,
+			ProcessorsPerChannel: 1,
+			RXChecksumOffload:    true,
+			TXChecksumOffload:    t.txChecksumOffload,
 		})
 		if err != nil {
 			return nil, stack.NICOptions{}, err