diff --git a/proxy/proxy.go b/proxy/proxy.go
index d57b47bce..6008437eb 100644
--- a/proxy/proxy.go
+++ b/proxy/proxy.go
@@ -13,7 +13,6 @@ import (
 	"math/big"
 	"runtime"
 	"strconv"
-	"sync"
 	"time"
 
 	"github.com/pires/go-proxyproto"
@@ -302,7 +301,6 @@ type VisionWriter struct {
 	// internal
 	writeOnceUserUUID  []byte
 	directWriteCounter stats.Counter
-	access             sync.Mutex
 
 	testseed []uint32
 }
@@ -326,9 +324,6 @@ func NewVisionWriter(writer buf.Writer, trafficState *TrafficState, isUplink boo
 }
 
 func (w *VisionWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
-	w.access.Lock()
-	defer w.access.Unlock()
-
 	var isPadding *bool
 	var switchToDirectCopy *bool
 	var spliceReadyInbound *session.Inbound