diff --git a/src/server/game/player_mod.go b/src/server/game/player_mod.go
index ad73eff0..87d5b647 100644
--- a/src/server/game/player_mod.go
+++ b/src/server/game/player_mod.go
@@ -262,14 +262,17 @@ func (p *PlayerMod) ClearData(player *Player) {
 }
 
 func (p *PlayerMod) BackUp(B *PlayerBackUp) {
-	var buf bytes.Buffer
-	encode := gob.NewEncoder(&buf)
+	// 预分配 buffer 容量，避免动态扩容，根据实际数据大小可调整
+	now := time.Now()
+	buf := bytes.NewBuffer(make([]byte, 0, 128*1024))
+	encode := gob.NewEncoder(buf)
 	err := encode.Encode(p.mod_list)
 	if err != nil {
 		log.Debug("Backup, playmod error %v", err)
 		return
 	}
 	B.PlayMod = buf.Bytes()
+	log.Debug("backup player, cost time %v", time.Since(now))
 }
 
 func (p *PlayerMod) Recover(B *PlayerBackUp) {