diff --git a/cmd/main.go b/cmd/main.go
index 66927ec..413ca53 100755
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -11,7 +11,6 @@ import (
 	"reflect"
 	"runtime"
 	"strings"
-	"sync"
 	"syscall"
 	"time"
 
@@ -137,13 +136,11 @@ func main() {
 	signal.Notify(sig, syscall.SIGHUP)
 
 	autocert := cfg.GetAutoCertProvider()
-
 	if autocert != nil {
 		ctx, cancel := context.WithCancel(context.Background())
+		onShutdown.Add(cancel)
 		if err := autocert.Setup(ctx); err != nil {
 			l.Fatal(err)
-		} else {
-			onShutdown.Add(cancel)
 		}
 	} else {
 		l.Info("autocert not configured")
@@ -179,19 +176,15 @@ func main() {
 	// grafully shutdown
 	logrus.Info("shutting down")
 	done := make(chan struct{}, 1)
+	currentIdx := 0
 
-	var wg sync.WaitGroup
-	wg.Add(onShutdown.Size())
-	onShutdown.ForEach(func(f func()) {
-		go func() {
+	go func() {
+		onShutdown.ForEach(func(f func()) {
 			l.Debugf("waiting for %s to complete...", funcName(f))
 			f()
+			currentIdx++
 			l.Debugf("%s done", funcName(f))
-			wg.Done()
-		}()
-	})
-	go func() {
-		wg.Wait()
+		})
 		close(done)
 	}()
 
@@ -201,9 +194,9 @@ func main() {
 		logrus.Info("shutdown complete")
 	case <-timeout:
 		logrus.Info("timeout waiting for shutdown")
-		onShutdown.ForEach(func(f func()) {
-			l.Warnf("%s() is still running", funcName(f))
-		})
+		for i := currentIdx; i < onShutdown.Size(); i++ {
+			l.Warnf("%s() is still running", funcName(onShutdown.Get(i)))
+		}
 	}
 }
 
diff --git a/internal/config/config.go b/internal/config/config.go
index 370ad25..071a524 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -220,7 +220,7 @@ func (cfg *Config) loadProviders(providers *types.ProxyProviders) (res E.NestedE
 func (cfg *Config) controlProviders(action string, do func(*PR.Provider) E.NestedError) {
 	errors := E.NewBuilder("errors in %s these providers", action)
 
-	cfg.proxyProviders.RangeAll(func(name string, p *PR.Provider) {
+	cfg.proxyProviders.RangeAllParallel(func(name string, p *PR.Provider) {
 		if err := do(p); err.HasError() {
 			errors.Add(err.Subject(p))
 		}
diff --git a/internal/docker/client.go b/internal/docker/client.go
index 4132857..8d2845f 100644
--- a/internal/docker/client.go
+++ b/internal/docker/client.go
@@ -133,7 +133,7 @@ func ConnectClient(host string) (Client, E.NestedError) {
 }
 
 func CloseAllClients() {
-	clientMap.RangeAll(func(_ string, c Client) {
+	clientMap.RangeAllParallel(func(_ string, c Client) {
 		c.Client.Close()
 	})
 	clientMap.Clear()
diff --git a/internal/net/http/loadbalancer/loadbalancer.go b/internal/net/http/loadbalancer/loadbalancer.go
index 4de47db..466083f 100644
--- a/internal/net/http/loadbalancer/loadbalancer.go
+++ b/internal/net/http/loadbalancer/loadbalancer.go
@@ -46,7 +46,7 @@ func New(cfg Config) *LoadBalancer {
 	lb := &LoadBalancer{Config: cfg, pool: servers{}}
 	mode := cfg.Mode
 	if !cfg.Mode.ValidateUpdate() {
-		logger.Warnf("%s: invalid loadbalancer mode: %s, fallback to %s", cfg.Link, mode, cfg.Mode)
+		logger.Warnf("loadbalancer %s: invalid mode %q, fallback to %s", cfg.Link, mode, cfg.Mode)
 	}
 	switch mode {
 	case RoundRobin:
@@ -69,6 +69,7 @@ func (lb *LoadBalancer) AddServer(srv *Server) {
 	lb.sumWeight += srv.Weight
 
 	lb.impl.OnAddServer(srv)
+	logger.Debugf("[add] loadbalancer %s: %d servers available", lb.Link, len(lb.pool))
 }
 
 func (lb *LoadBalancer) RemoveServer(srv *Server) {
@@ -85,7 +86,11 @@ func (lb *LoadBalancer) RemoveServer(srv *Server) {
 	}
 	if lb.IsEmpty() {
 		lb.Stop()
+		return
 	}
+
+	lb.Rebalance()
+	logger.Debugf("[remove] loadbalancer %s: %d servers left", lb.Link, len(lb.pool))
 }
 
 func (lb *LoadBalancer) IsEmpty() bool {
@@ -98,14 +103,14 @@ func (lb *LoadBalancer) Rebalance() {
 	}
 	if lb.sumWeight == 0 { // distribute evenly
 		weightEach := maxWeight / weightType(len(lb.pool))
-		remainer := maxWeight % weightType(len(lb.pool))
+		remainder := maxWeight % weightType(len(lb.pool))
 		for _, s := range lb.pool {
 			s.Weight = weightEach
 			lb.sumWeight += weightEach
-			if remainer > 0 {
+			if remainder > 0 {
 				s.Weight++
+				remainder--
 			}
-			remainer--
 		}
 		return
 	}
@@ -149,17 +154,13 @@ func (lb *LoadBalancer) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
 }
 
 func (lb *LoadBalancer) Start() {
-	if lb.IsEmpty() {
-		return
-	}
-
 	if lb.sumWeight != 0 && lb.sumWeight != maxWeight {
 		msg := E.NewBuilder("loadbalancer %s total weight %d != %d", lb.Link, lb.sumWeight, maxWeight)
 		for _, s := range lb.pool {
 			msg.Addf("%s: %d", s.Name, s.Weight)
 		}
 		lb.Rebalance()
-		inner := E.NewBuilder("After rebalancing")
+		inner := E.NewBuilder("after rebalancing")
 		for _, s := range lb.pool {
 			inner.Addf("%s: %d", s.Name, s.Weight)
 		}
@@ -168,22 +169,16 @@ func (lb *LoadBalancer) Start() {
 	}
 
 	if lb.sumWeight != 0 {
-		log.Warnf("Weighted mode not supported yet")
-	}
-
-	switch lb.Mode {
-	case RoundRobin:
-		lb.impl = lb.newRoundRobin()
-	case LeastConn:
-		lb.impl = lb.newLeastConn()
-	case IPHash:
-		lb.impl = lb.newIPHash()
+		log.Warnf("weighted mode not supported yet")
 	}
 
 	lb.done = make(chan struct{}, 1)
 	lb.ctx, lb.cancel = context.WithCancel(context.Background())
 
 	updateAll := func() {
+		lb.poolMu.Lock()
+		defer lb.poolMu.Unlock()
+
 		var wg sync.WaitGroup
 		wg.Add(len(lb.pool))
 		for _, s := range lb.pool {
@@ -195,6 +190,8 @@ func (lb *LoadBalancer) Start() {
 		wg.Wait()
 	}
 
+	logger.Debugf("loadbalancer %s started", lb.Link)
+
 	go func() {
 		defer lb.cancel()
 		defer close(lb.done)
@@ -208,16 +205,14 @@ func (lb *LoadBalancer) Start() {
 			case <-lb.ctx.Done():
 				return
 			case <-ticker.C:
-				lb.poolMu.RLock()
 				updateAll()
-				lb.poolMu.RUnlock()
 			}
 		}
 	}()
 }
 
 func (lb *LoadBalancer) Stop() {
-	if lb.impl == nil {
+	if lb.cancel == nil {
 		return
 	}
 
@@ -225,6 +220,8 @@ func (lb *LoadBalancer) Stop() {
 
 	<-lb.done
 	lb.pool = nil
+
+	logger.Debugf("loadbalancer %s stopped", lb.Link)
 }
 
 func (lb *LoadBalancer) availServers() servers {
diff --git a/internal/net/http/loadbalancer/server.go b/internal/net/http/loadbalancer/server.go
index 798693b..52fff16 100644
--- a/internal/net/http/loadbalancer/server.go
+++ b/internal/net/http/loadbalancer/server.go
@@ -26,7 +26,7 @@ func NewServer(name string, url types.URL, weight weightType, handler http.Handl
 	srv := &Server{
 		Name:    name,
 		URL:     url,
-		Weight:  weightType(weight),
+		Weight:  weight,
 		handler: handler,
 		pinger:  &http.Client{Timeout: 3 * time.Second},
 	}
diff --git a/internal/proxy/provider/file.go b/internal/proxy/provider/file.go
index 289641c..e3df8bd 100644
--- a/internal/proxy/provider/file.go
+++ b/internal/proxy/provider/file.go
@@ -52,12 +52,12 @@ func (p FileProvider) OnEvent(event W.Event, routes R.Routes) (res EventResult)
 		return
 	}
 
-	routes.RangeAll(func(_ string, v R.Route) {
+	routes.RangeAllParallel(func(_ string, v R.Route) {
 		b.Add(v.Stop())
 	})
 	routes.Clear()
 
-	newRoutes.RangeAll(func(_ string, v R.Route) {
+	newRoutes.RangeAllParallel(func(_ string, v R.Route) {
 		b.Add(v.Start())
 	})
 
diff --git a/internal/proxy/provider/provider.go b/internal/proxy/provider/provider.go
index b17044c..322789b 100644
--- a/internal/proxy/provider/provider.go
+++ b/internal/proxy/provider/provider.go
@@ -114,7 +114,7 @@ func (p *Provider) StartAllRoutes() (res E.NestedError) {
 	nStarted := 0
 	nFailed := 0
 
-	p.routes.RangeAll(func(alias string, r R.Route) {
+	p.routes.RangeAllParallel(func(alias string, r R.Route) {
 		if err := r.Start(); err.HasError() {
 			errors.Add(err.Subject(r))
 			nFailed++
@@ -138,7 +138,7 @@ func (p *Provider) StopAllRoutes() (res E.NestedError) {
 
 	nStopped := 0
 	nFailed := 0
-	p.routes.RangeAll(func(alias string, r R.Route) {
+	p.routes.RangeAllParallel(func(alias string, r R.Route) {
 		if err := r.Stop(); err.HasError() {
 			errors.Add(err.Subject(r))
 			nFailed++
diff --git a/internal/route/http.go b/internal/route/http.go
index 61d0378..fff7dd3 100755
--- a/internal/route/http.go
+++ b/internal/route/http.go
@@ -22,7 +22,7 @@ import (
 type (
 	HTTPRoute struct {
 		*P.ReverseProxyEntry
-		LoadBalancer *loadbalancer.LoadBalancer `json:"load_balancer,omitempty"`
+		LoadBalancer *loadbalancer.LoadBalancer `json:"load_balancer"`
 
 		server  *loadbalancer.Server
 		handler http.Handler
@@ -134,7 +134,8 @@ func (r *HTTPRoute) Start() E.NestedError {
 		}
 		httpRoutes.Store(string(r.LoadBalance.Link), linked)
 	}
-	lb.AddServer(loadbalancer.NewServer(string(r.Alias), r.rp.TargetURL, r.LoadBalance.Weight, r.handler))
+	r.server = loadbalancer.NewServer(string(r.Alias), r.rp.TargetURL, r.LoadBalance.Weight, r.handler)
+	lb.AddServer(r.server)
 	return nil
 }
 
@@ -150,8 +151,6 @@ func (r *HTTPRoute) Stop() (_ E.NestedError) {
 		waker.Unregister()
 	}
 
-	r.handler = nil
-
 	if r.server != nil {
 		linked, ok := httpRoutes.Load(string(r.LoadBalance.Link))
 		if ok {
@@ -160,9 +159,13 @@ func (r *HTTPRoute) Stop() (_ E.NestedError) {
 		if linked.LoadBalancer.IsEmpty() {
 			httpRoutes.Delete(string(r.LoadBalance.Link))
 		}
+		r.server = nil
 	} else {
 		httpRoutes.Delete(string(r.Alias))
 	}
+
+	r.handler = nil
+
 	return
 }
 
diff --git a/internal/route/udp.go b/internal/route/udp.go
index 83227b4..cecc16d 100755
--- a/internal/route/udp.go
+++ b/internal/route/udp.go
@@ -108,7 +108,7 @@ func (route *UDPRoute) CloseListeners() {
 		route.listeningConn.Close()
 		route.listeningConn = nil
 	}
-	route.connMap.RangeAll(func(_ string, conn *UDPConn) {
+	route.connMap.RangeAllParallel(func(_ string, conn *UDPConn) {
 		if err := conn.src.Close(); err != nil {
 			route.l.Errorf("error closing src conn: %s", err)
 		}
diff --git a/internal/utils/functional/map.go b/internal/utils/functional/map.go
index e0d3284..b578e5b 100644
--- a/internal/utils/functional/map.go
+++ b/internal/utils/functional/map.go
@@ -1,6 +1,8 @@
 package functional
 
 import (
+	"sync"
+
 	"github.com/puzpuzpuz/xsync/v3"
 	"gopkg.in/yaml.v3"
 
@@ -75,6 +77,20 @@ func (m Map[KT, VT]) RangeAll(do func(k KT, v VT)) {
 	})
 }
 
+func (m Map[KT, VT]) RangeAllParallel(do func(k KT, v VT)) {
+	var wg sync.WaitGroup
+	wg.Add(m.Size())
+
+	m.Range(func(k KT, v VT) bool {
+		go func() {
+			do(k, v)
+			wg.Done()
+		}()
+		return true
+	})
+	wg.Wait()
+}
+
 func (m Map[KT, VT]) RemoveAll(criteria func(VT) bool) {
 	m.Range(func(k KT, v VT) bool {
 		if criteria(v) {
diff --git a/internal/utils/functional/slice.go b/internal/utils/functional/slice.go
index d992aae..035e10e 100644
--- a/internal/utils/functional/slice.go
+++ b/internal/utils/functional/slice.go
@@ -38,6 +38,10 @@ func (s *Slice[T]) Iterator() []T {
 	return s.s
 }
 
+func (s *Slice[T]) Get(i int) T {
+	return s.s[i]
+}
+
 func (s *Slice[T]) Set(i int, v T) {
 	s.s[i] = v
 }
@@ -76,6 +80,20 @@ func (s *Slice[T]) SafePop() T {
 	return s.Pop()
 }
 
+func (s *Slice[T]) Remove(criteria func(T) bool) {
+	for i, v2 := range s.s {
+		if criteria(v2) {
+			s.s = append(s.s[:i], s.s[i+1:]...)
+		}
+	}
+}
+
+func (s *Slice[T]) SafeRemove(criteria func(T) bool) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.Remove(criteria)
+}
+
 func (s *Slice[T]) ForEach(do func(T)) {
 	for _, v := range s.s {
 		do(v)