diff --git a/kernel/sql/queue.go b/kernel/sql/queue.go
index df9cfe9f2..c8528f850 100644
--- a/kernel/sql/queue.go
+++ b/kernel/sql/queue.go
@@ -128,11 +128,15 @@ func FlushQueue() {
 			return
 		}
 
-		if 16 < i && 0 == i%256 {
+		if 16 < i && 0 == i%128 {
 			runtime.GC()
 		}
 	}
 
+	if 128 < len(ops) {
+		runtime.GC()
+	}
+
 	elapsed := time.Now().Sub(start).Milliseconds()
 	if 5000 < elapsed {
 		logging.LogInfof("op tx [%dms]", elapsed)
diff --git a/kernel/treenode/blocktree.go b/kernel/treenode/blocktree.go
index 4cddf9217..ff18cf3e4 100644
--- a/kernel/treenode/blocktree.go
+++ b/kernel/treenode/blocktree.go
@@ -488,10 +488,15 @@ func SaveBlockTree(force bool) {
 	os.MkdirAll(util.BlockTreePath, 0755)
 
 	size := uint64(0)
-	blockTrees.Range(func(key, value interface{}) bool {
-		slice := value.(*btSlice)
+	poolSize := runtime.NumCPU()
+	waitGroup := &sync.WaitGroup{}
+	p, _ := ants.NewPoolWithFunc(poolSize, func(arg interface{}) {
+		defer waitGroup.Done()
+
+		key := arg.(map[string]interface{})["key"].(string)
+		slice := arg.(map[string]interface{})["value"].(*btSlice)
 		if !force && (slice.changed.IsZero() || slice.changed.After(start.Add(-7*time.Second))) {
-			return true
+			return
 		}
 
 		slice.m.Lock()
@@ -499,24 +504,37 @@ func SaveBlockTree(force bool) {
 		if nil != err {
 			logging.LogErrorf("marshal block tree failed: %s", err)
 			os.Exit(util.ExitCodeBlockTreeErr)
-			return false
+			return
 		}
 		slice.m.Unlock()
 
-		p := filepath.Join(util.BlockTreePath, key.(string)) + ".msgpack"
+		p := filepath.Join(util.BlockTreePath, key) + ".msgpack"
 		if err = gulu.File.WriteFileSafer(p, data, 0644); nil != err {
 			logging.LogErrorf("write block tree failed: %s", err)
 			os.Exit(util.ExitCodeBlockTreeErr)
-			return false
+			return
 		}
 		slice.changed = time.Time{}
 		size += uint64(len(data))
+	})
+
+	blockTrees.Range(func(key, value interface{}) bool {
+		slice := value.(*btSlice)
+		if !force && (slice.changed.IsZero() || slice.changed.After(start.Add(-7*time.Second))) {
+			return true
+		}
+
+		waitGroup.Add(1)
+		p.Invoke(map[string]interface{}{"key": key, "value": value})
 		return true
 	})
 
-	runtime.GC()
+	waitGroup.Wait()
+	p.Release()
 
-	if elapsed := time.Since(start).Seconds(); 2 < elapsed {
+	runtime.GC()
+	elapsed := time.Since(start).Seconds()
+	if 2 < elapsed {
 		logging.LogWarnf("save block tree [size=%s] to [%s], elapsed [%.2fs]", humanize.Bytes(size), util.BlockTreePath, elapsed)
 	}
 }