diff --git a/internal/iplibrary/ip_list_kv.go b/internal/iplibrary/ip_list_kv.go
index a81cd52..a56469e 100644
--- a/internal/iplibrary/ip_list_kv.go
+++ b/internal/iplibrary/ip_list_kv.go
@@ -10,6 +10,7 @@ import (
 	"github.com/TeaOSLab/EdgeNode/internal/goman"
 	"github.com/TeaOSLab/EdgeNode/internal/remotelogs"
 	"github.com/TeaOSLab/EdgeNode/internal/utils/fasttime"
+	fsutils "github.com/TeaOSLab/EdgeNode/internal/utils/fs"
 	"github.com/TeaOSLab/EdgeNode/internal/utils/kvstore"
 	"testing"
 	"time"
@@ -78,6 +79,8 @@ func (this *KVIPList) init() error {
 		})
 
 		for range this.cleanTicker.C {
+			fsutils.WaitLoad(15, 16, 1*time.Hour)
+
 			deleteErr := this.DeleteExpiredItems()
 			if deleteErr != nil {
 				remotelogs.Error("IP_LIST_DB", "clean expired items failed: "+deleteErr.Error())
diff --git a/internal/iplibrary/ip_list_sqlite.go b/internal/iplibrary/ip_list_sqlite.go
index e1894f8..8e12fc8 100644
--- a/internal/iplibrary/ip_list_sqlite.go
+++ b/internal/iplibrary/ip_list_sqlite.go
@@ -8,6 +8,7 @@ import (
 	"github.com/TeaOSLab/EdgeNode/internal/goman"
 	"github.com/TeaOSLab/EdgeNode/internal/remotelogs"
 	"github.com/TeaOSLab/EdgeNode/internal/utils/dbs"
+	fsutils "github.com/TeaOSLab/EdgeNode/internal/utils/fs"
 	"github.com/iwind/TeaGo/Tea"
 	"os"
 	"path/filepath"
@@ -167,9 +168,11 @@ ON "` + this.itemTableName + `" (
 		})
 
 		for range this.cleanTicker.C {
-			err := this.DeleteExpiredItems()
-			if err != nil {
-				remotelogs.Error("IP_LIST_DB", "clean expired items failed: "+err.Error())
+			fsutils.WaitLoad(15, 16, 1*time.Hour)
+
+			deleteErr := this.DeleteExpiredItems()
+			if deleteErr != nil {
+				remotelogs.Error("IP_LIST_DB", "clean expired items failed: "+deleteErr.Error())
 			}
 		}
 	})
diff --git a/internal/metrics/task_kv.go b/internal/metrics/task_kv.go
index 9967983..febd108 100644
--- a/internal/metrics/task_kv.go
+++ b/internal/metrics/task_kv.go
@@ -11,6 +11,7 @@ import (
 	"github.com/TeaOSLab/EdgeNode/internal/trackers"
 	"github.com/TeaOSLab/EdgeNode/internal/utils"
 	byteutils "github.com/TeaOSLab/EdgeNode/internal/utils/byte"
+	fsutils "github.com/TeaOSLab/EdgeNode/internal/utils/fs"
 	"github.com/TeaOSLab/EdgeNode/internal/utils/kvstore"
 	"github.com/TeaOSLab/EdgeNode/internal/zero"
 	"github.com/cockroachdb/pebble"
@@ -287,6 +288,8 @@ func (this *KVTask) Start() error {
 	this.cleanTicker = utils.NewTicker(24 * time.Hour)
 	goman.New(func() {
 		for this.cleanTicker.Next() {
+			fsutils.WaitLoad(15, 16, 1*time.Hour)
+
 			var tr = trackers.Begin("METRIC:CLEAN_EXPIRED")
 			err := this.CleanExpired()
 			tr.End()
diff --git a/internal/metrics/task_sqlite.go b/internal/metrics/task_sqlite.go
index 3ca3181..6cda3d1 100644
--- a/internal/metrics/task_sqlite.go
+++ b/internal/metrics/task_sqlite.go
@@ -13,6 +13,7 @@ import (
 	"github.com/TeaOSLab/EdgeNode/internal/trackers"
 	"github.com/TeaOSLab/EdgeNode/internal/utils"
 	"github.com/TeaOSLab/EdgeNode/internal/utils/dbs"
+	fsutils "github.com/TeaOSLab/EdgeNode/internal/utils/fs"
 	"github.com/TeaOSLab/EdgeNode/internal/zero"
 	"github.com/iwind/TeaGo/Tea"
 	"github.com/iwind/TeaGo/types"
@@ -209,6 +210,8 @@ func (this *SQLiteTask) Start() error {
 	this.cleanTicker = utils.NewTicker(24 * time.Hour)
 	goman.New(func() {
 		for this.cleanTicker.Next() {
+			fsutils.WaitLoad(15, 16, 1*time.Hour)
+
 			var tr = trackers.Begin("METRIC:CLEAN_EXPIRED")
 			err := this.CleanExpired()
 			tr.End()
diff --git a/internal/nodes/task_trim_disks.go b/internal/nodes/task_trim_disks.go
index 1445983..f3ebfbb 100644
--- a/internal/nodes/task_trim_disks.go
+++ b/internal/nodes/task_trim_disks.go
@@ -6,7 +6,7 @@ import (
 	"fmt"
 	"github.com/TeaOSLab/EdgeNode/internal/remotelogs"
 	executils "github.com/TeaOSLab/EdgeNode/internal/utils/exec"
-	"github.com/shirou/gopsutil/v3/load"
+	fsutils "github.com/TeaOSLab/EdgeNode/internal/utils/fs"
 	"runtime"
 	"time"
 )
@@ -31,15 +31,7 @@ func (this *TrimDisksTask) Start() {
 	var ticker = time.NewTicker(2 * 24 * time.Hour) // every 2 days
 	for range ticker.C {
 		// prevent system overload
-		for i := 0; i < 24; i++ {
-			stat, loadErr := load.Avg()
-			if loadErr == nil && stat != nil && stat.Load1 > 15 {
-				// wait load downgrade
-				time.Sleep(1 * time.Hour)
-			} else {
-				break
-			}
-		}
+		fsutils.WaitLoad(15, 24, 1*time.Hour)
 
 		// run the task
 		err = this.loop()
diff --git a/internal/stats/dau_manager.go b/internal/stats/dau_manager.go
index bf30857..e43935a 100644
--- a/internal/stats/dau_manager.go
+++ b/internal/stats/dau_manager.go
@@ -9,6 +9,7 @@ import (
 	"github.com/TeaOSLab/EdgeNode/internal/goman"
 	"github.com/TeaOSLab/EdgeNode/internal/remotelogs"
 	"github.com/TeaOSLab/EdgeNode/internal/utils/fasttime"
+	fsutils "github.com/TeaOSLab/EdgeNode/internal/utils/fs"
 	"github.com/TeaOSLab/EdgeNode/internal/utils/kvstore"
 	"github.com/iwind/TeaGo/Tea"
 	"github.com/iwind/TeaGo/types"
@@ -94,6 +95,8 @@ func (this *DAUManager) Init() error {
 	// clean expires items
 	goman.New(func() {
 		for range this.cleanTicker.C {
+			fsutils.WaitLoad(15, 16, 1*time.Hour)
+
 			err := this.CleanStats()
 			if err != nil {
 				remotelogs.Error("DAU_MANAGER", "clean stats failed: "+err.Error())
diff --git a/internal/utils/fs/status.go b/internal/utils/fs/status.go
index ba84fac..1c6d7ad 100644
--- a/internal/utils/fs/status.go
+++ b/internal/utils/fs/status.go
@@ -140,3 +140,13 @@ func calculateDiskMaxWrites() {
 		DiskMaxWrites = 4
 	}
 }
+
+// WaitLoad wait system load to downgrade
+func WaitLoad(maxLoad float64, maxLoops int, delay time.Duration) {
+	for i := 0; i < maxLoops; i++ {
+		stat, err := load.Avg()
+		if err == nil && stat.Load1 > maxLoad {
+			time.Sleep(delay)
+		}
+	}
+}
diff --git a/internal/utils/fs/status_test.go b/internal/utils/fs/status_test.go
index 2e30cff..82450c5 100644
--- a/internal/utils/fs/status_test.go
+++ b/internal/utils/fs/status_test.go
@@ -6,6 +6,7 @@ import (
 	fsutils "github.com/TeaOSLab/EdgeNode/internal/utils/fs"
 	"github.com/iwind/TeaGo/assert"
 	"testing"
+	"time"
 )
 
 func TestWrites(t *testing.T) {
@@ -20,6 +21,10 @@ func TestWrites(t *testing.T) {
 	a.IsTrue(fsutils.WriteReady())
 }
 
+func TestWaitLoad(t *testing.T) {
+	fsutils.WaitLoad(100, 1, 1 * time.Minute)
+}
+
 func BenchmarkWrites(b *testing.B) {
 	b.RunParallel(func(pb *testing.PB) {
 		for pb.Next() {