diff --git a/box.go b/box.go
index fe1c1b8d..b4d5cb5d 100644
--- a/box.go
+++ b/box.go
@@ -235,7 +235,7 @@ func (s *Box) Start() error {
 }
 
 func (s *Box) preStart() error {
-	monitor := taskmonitor.New(s.logger, C.DefaultStartTimeout)
+	monitor := taskmonitor.New(s.logger, C.StartTimeout)
 	monitor.Start("start logger")
 	err := s.logFactory.Start()
 	monitor.Finish()
@@ -331,7 +331,7 @@ func (s *Box) Close() error {
 	default:
 		close(s.done)
 	}
-	monitor := taskmonitor.New(s.logger, C.DefaultStopTimeout)
+	monitor := taskmonitor.New(s.logger, C.StopTimeout)
 	var errors error
 	for serviceName, service := range s.postServices {
 		monitor.Start("close ", serviceName)
diff --git a/box_outbound.go b/box_outbound.go
index 95ba950a..6e3f0617 100644
--- a/box_outbound.go
+++ b/box_outbound.go
@@ -12,7 +12,7 @@ import (
 )
 
 func (s *Box) startOutbounds() error {
-	monitor := taskmonitor.New(s.logger, C.DefaultStartTimeout)
+	monitor := taskmonitor.New(s.logger, C.StartTimeout)
 	outboundTags := make(map[adapter.Outbound]string)
 	outbounds := make(map[string]adapter.Outbound)
 	for i, outboundToStart := range s.outbounds {
diff --git a/cmd/sing-box/cmd_run.go b/cmd/sing-box/cmd_run.go
index bde811f7..3c4dd0d9 100644
--- a/cmd/sing-box/cmd_run.go
+++ b/cmd/sing-box/cmd_run.go
@@ -199,7 +199,7 @@ func run() error {
 }
 
 func closeMonitor(ctx context.Context) {
-	time.Sleep(C.DefaultStopFatalTimeout)
+	time.Sleep(C.FatalStopTimeout)
 	select {
 	case <-ctx.Done():
 		return
diff --git a/constant/timeout.go b/constant/timeout.go
index 8d9ffbba..0d7a0b7d 100644
--- a/constant/timeout.go
+++ b/constant/timeout.go
@@ -3,15 +3,16 @@ package constant
 import "time"
 
 const (
-	TCPTimeout                = 5 * time.Second
-	ReadPayloadTimeout        = 300 * time.Millisecond
-	DNSTimeout                = 10 * time.Second
-	QUICTimeout               = 30 * time.Second
-	STUNTimeout               = 15 * time.Second
-	UDPTimeout                = 5 * time.Minute
-	DefaultURLTestInterval    = 3 * time.Minute
-	DefaultURLTestIdleTimeout = 30 * time.Minute
-	DefaultStartTimeout       = 10 * time.Second
-	DefaultStopTimeout        = 5 * time.Second
-	DefaultStopFatalTimeout   = 10 * time.Second
+	TCPTimeout                 = 5 * time.Second
+	ReadPayloadTimeout         = 300 * time.Millisecond
+	DNSTimeout                 = 10 * time.Second
+	QUICTimeout                = 30 * time.Second
+	STUNTimeout                = 15 * time.Second
+	UDPTimeout                 = 5 * time.Minute
+	DefaultURLTestInterval     = 3 * time.Minute
+	DefaultURLTestIdleTimeout  = 30 * time.Minute
+	StartTimeout               = 10 * time.Second
+	StopTimeout                = 5 * time.Second
+	FatalStopTimeout           = 10 * time.Second
+	FakeIPMetadataSaveInterval = 10 * time.Second
 )
diff --git a/experimental/cachefile/fakeip.go b/experimental/cachefile/fakeip.go
index e998ebb8..690b0d91 100644
--- a/experimental/cachefile/fakeip.go
+++ b/experimental/cachefile/fakeip.go
@@ -7,6 +7,7 @@ import (
 
 	"github.com/sagernet/bbolt"
 	"github.com/sagernet/sing-box/adapter"
+	C "github.com/sagernet/sing-box/constant"
 	"github.com/sagernet/sing/common/logger"
 	M "github.com/sagernet/sing/common/metadata"
 )
@@ -58,12 +59,13 @@ func (c *CacheFile) FakeIPSaveMetadata(metadata *adapter.FakeIPMetadata) error {
 }
 
 func (c *CacheFile) FakeIPSaveMetadataAsync(metadata *adapter.FakeIPMetadata) {
-	if timer := c.saveMetadataTimer; timer != nil {
-		timer.Stop()
+	if c.saveMetadataTimer == nil {
+		c.saveMetadataTimer = time.AfterFunc(C.FakeIPMetadataSaveInterval, func() {
+			_ = c.FakeIPSaveMetadata(metadata)
+		})
+	} else {
+		c.saveMetadataTimer.Reset(C.FakeIPMetadataSaveInterval)
 	}
-	c.saveMetadataTimer = time.AfterFunc(10*time.Second, func() {
-		_ = c.FakeIPSaveMetadata(metadata)
-	})
 }
 
 func (c *CacheFile) FakeIPStore(address netip.Addr, domain string) error {
diff --git a/experimental/libbox/service.go b/experimental/libbox/service.go
index bfc48094..030aee8d 100644
--- a/experimental/libbox/service.go
+++ b/experimental/libbox/service.go
@@ -81,7 +81,7 @@ func (s *BoxService) Close() error {
 		select {
 		case <-done:
 			return
-		case <-time.After(C.DefaultStopFatalTimeout):
+		case <-time.After(C.FatalStopTimeout):
 			os.Exit(1)
 		}
 	}()
diff --git a/inbound/tun.go b/inbound/tun.go
index 7a08b1ec..c86273d8 100644
--- a/inbound/tun.go
+++ b/inbound/tun.go
@@ -153,7 +153,7 @@ func (t *Tun) Start() error {
 		tunInterface tun.Tun
 		err          error
 	)
-	monitor := taskmonitor.New(t.logger, C.DefaultStartTimeout)
+	monitor := taskmonitor.New(t.logger, C.StartTimeout)
 	monitor.Start("open tun interface")
 	if t.platformInterface != nil {
 		tunInterface, err = t.platformInterface.OpenTun(&t.tunOptions, t.platformOptions)
diff --git a/route/router.go b/route/router.go
index a62a318b..3f5d2f40 100644
--- a/route/router.go
+++ b/route/router.go
@@ -422,7 +422,7 @@ func (r *Router) Outbounds() []adapter.Outbound {
 }
 
 func (r *Router) PreStart() error {
-	monitor := taskmonitor.New(r.logger, C.DefaultStartTimeout)
+	monitor := taskmonitor.New(r.logger, C.StartTimeout)
 	if r.interfaceMonitor != nil {
 		monitor.Start("initialize interface monitor")
 		err := r.interfaceMonitor.Start()
@@ -451,7 +451,7 @@ func (r *Router) PreStart() error {
 }
 
 func (r *Router) Start() error {
-	monitor := taskmonitor.New(r.logger, C.DefaultStartTimeout)
+	monitor := taskmonitor.New(r.logger, C.StartTimeout)
 	if r.needGeoIPDatabase {
 		monitor.Start("initialize geoip database")
 		err := r.prepareGeoIPDatabase()
@@ -606,7 +606,7 @@ func (r *Router) Start() error {
 }
 
 func (r *Router) Close() error {
-	monitor := taskmonitor.New(r.logger, C.DefaultStopTimeout)
+	monitor := taskmonitor.New(r.logger, C.StopTimeout)
 	var err error
 	for i, rule := range r.rules {
 		monitor.Start("close rule[", i, "]")