diff --git a/world.go b/world.go
index 7df1c3d..75afe48 100644
--- a/world.go
+++ b/world.go
@@ -13,7 +13,7 @@ import (
 
 type WorldState int
 
-type WorldId int
+type WorldId = donburi.WorldId
 
 const (
 	Init WorldState = iota
@@ -179,7 +179,6 @@ func (w *world) executeTodos() {
 }
 func (w *world) run() {
 	for {
-		start := time.Now()
 		select {
 		case <-w.quit: // 退出信号
 			// 仿真退出,更新状态
@@ -196,6 +195,7 @@ func (w *world) run() {
 			return
 		}
 		<-w.ticker.C
+		// start := time.Now()
 		if w.state == Pause { // 暂停不更新
 			continue
 		}
@@ -214,7 +214,7 @@ func (w *world) run() {
 		} else {
 			w.times += w.speed
 		}
-		dt := time.Since(start)
-		fmt.Println("仿真执行耗时:", dt.Milliseconds(), "ms")
+		// dt := time.Since(start)
+		// fmt.Println("仿真系统执行耗时:", dt.Milliseconds(), "ms")
 	}
 }