diff --git a/adapter/outbound/tuic.go b/adapter/outbound/tuic.go
index 97938014c..264c991be 100644
--- a/adapter/outbound/tuic.go
+++ b/adapter/outbound/tuic.go
@@ -169,12 +169,12 @@ func NewTuic(option TuicOption) (*Tuic, error) {
 		EnableDatagrams:                true,
 	}
 	if option.ReceiveWindowConn == 0 {
-		quicConfig.InitialStreamReceiveWindow = DefaultStreamReceiveWindow / 10
-		quicConfig.MaxStreamReceiveWindow = DefaultStreamReceiveWindow
+		quicConfig.InitialStreamReceiveWindow = tuic.DefaultStreamReceiveWindow / 10
+		quicConfig.MaxStreamReceiveWindow = tuic.DefaultStreamReceiveWindow
 	}
 	if option.ReceiveWindow == 0 {
-		quicConfig.InitialConnectionReceiveWindow = DefaultConnectionReceiveWindow / 10
-		quicConfig.MaxConnectionReceiveWindow = DefaultConnectionReceiveWindow
+		quicConfig.InitialConnectionReceiveWindow = tuic.DefaultConnectionReceiveWindow / 10
+		quicConfig.MaxConnectionReceiveWindow = tuic.DefaultConnectionReceiveWindow
 	}
 
 	if len(option.Ip) > 0 {
diff --git a/common/structure/structure.go b/common/structure/structure.go
index 2b5e024f4..958ad54b5 100644
--- a/common/structure/structure.go
+++ b/common/structure/structure.go
@@ -49,12 +49,12 @@ func (d *Decoder) Decode(src map[string]any, dst any) error {
 		key, omitKey, found := strings.Cut(tag, ",")
 		omitempty := found && omitKey == "omitempty"
 
-		if d.option.KeyReplacer != nil {
-			key = d.option.KeyReplacer.Replace(key)
-		}
-
 		value, ok := src[key]
 		if !ok {
+			if d.option.KeyReplacer != nil {
+				key = d.option.KeyReplacer.Replace(key)
+			}
+
 			for _strKey := range src {
 				strKey := _strKey
 				if d.option.KeyReplacer != nil {
@@ -364,9 +364,6 @@ func (d *Decoder) decodeStructFromMap(name string, dataVal, val reflect.Value) e
 		tagValue = strings.SplitN(tagValue, ",", 2)[0]
 		if tagValue != "" {
 			fieldName = tagValue
-			if d.option.KeyReplacer != nil {
-				fieldName = d.option.KeyReplacer.Replace(fieldName)
-			}
 		}
 
 		rawMapKey := reflect.ValueOf(fieldName)
@@ -374,6 +371,9 @@ func (d *Decoder) decodeStructFromMap(name string, dataVal, val reflect.Value) e
 		if !rawMapVal.IsValid() {
 			// Do a slower search by iterating over each key and
 			// doing case-insensitive search.
+			if d.option.KeyReplacer != nil {
+				fieldName = d.option.KeyReplacer.Replace(fieldName)
+			}
 			for dataValKey := range dataValKeys {
 				mK, ok := dataValKey.Interface().(string)
 				if !ok {
diff --git a/listener/tuic/server.go b/listener/tuic/server.go
index 870c9f806..64ec84896 100644
--- a/listener/tuic/server.go
+++ b/listener/tuic/server.go
@@ -17,11 +17,6 @@ import (
 	"github.com/Dreamacro/clash/transport/tuic"
 )
 
-const (
-	DefaultStreamReceiveWindow     = 15728640 // 15 MB/s
-	DefaultConnectionReceiveWindow = 67108864 // 64 MB/s
-)
-
 type Listener struct {
 	closed       bool
 	config       config.TuicServer
@@ -49,10 +44,10 @@ func New(config config.TuicServer, tcpIn chan<- C.ConnContext, udpIn chan<- *inb
 		MaxIncomingUniStreams: 1 >> 32,
 		EnableDatagrams:       true,
 	}
-	quicConfig.InitialStreamReceiveWindow = DefaultStreamReceiveWindow / 10
-	quicConfig.MaxStreamReceiveWindow = DefaultStreamReceiveWindow
-	quicConfig.InitialConnectionReceiveWindow = DefaultConnectionReceiveWindow / 10
-	quicConfig.MaxConnectionReceiveWindow = DefaultConnectionReceiveWindow
+	quicConfig.InitialStreamReceiveWindow = tuic.DefaultStreamReceiveWindow / 10
+	quicConfig.MaxStreamReceiveWindow = tuic.DefaultStreamReceiveWindow
+	quicConfig.InitialConnectionReceiveWindow = tuic.DefaultConnectionReceiveWindow / 10
+	quicConfig.MaxConnectionReceiveWindow = tuic.DefaultConnectionReceiveWindow
 
 	tokens := make([][32]byte, len(config.Token))
 	for i, token := range config.Token {
diff --git a/transport/tuic/conn.go b/transport/tuic/conn.go
index b030c3d83..3e759f25d 100644
--- a/transport/tuic/conn.go
+++ b/transport/tuic/conn.go
@@ -15,6 +15,11 @@ import (
 	"github.com/Dreamacro/clash/transport/tuic/congestion"
 )
 
+const (
+	DefaultStreamReceiveWindow     = 15728640 // 15 MB/s
+	DefaultConnectionReceiveWindow = 67108864 // 64 MB/s
+)
+
 func SetCongestionController(quicConn quic.Connection, cc string) {
 	switch cc {
 	case "cubic":