diff --git a/private/registry/registry.go b/private/registry/registry.go
index d5ddbef..f5579a7 100644
--- a/private/registry/registry.go
+++ b/private/registry/registry.go
@@ -108,9 +108,8 @@ func (r *serviceRegistry) ServiceCount() int {
 
 func (r *serviceRegistry) ForEachService(cb func(protoreflect.ServiceDescriptor) bool) {
 	r.lock.RLock()
-	services := r.services
-	r.lock.RUnlock()
-	for _, service := range services {
+	defer r.lock.RUnlock()
+	for _, service := range r.services {
 		if !cb(service) {
 			break
 		}
diff --git a/private/registry/registry_bench_test.go b/private/registry/registry_bench_test.go
new file mode 100644
index 0000000..0e34c31
--- /dev/null
+++ b/private/registry/registry_bench_test.go
@@ -0,0 +1,83 @@
+package registry
+
+import (
+	"fmt"
+	"testing"
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// A dummy service descriptor
+type dummyServiceDescriptor struct {
+    protoreflect.ServiceDescriptor
+    name protoreflect.FullName
+}
+
+func (d dummyServiceDescriptor) FullName() protoreflect.FullName {
+    return d.name
+}
+
+func BenchmarkForEachService_Current(b *testing.B) {
+	r, err := NewServiceRegistry()
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	for i := 0; i < 1000; i++ {
+		r.addService(dummyServiceDescriptor{name: protoreflect.FullName(fmt.Sprintf("service_%d", i))})
+	}
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		r.ForEachService(func(sd protoreflect.ServiceDescriptor) bool {
+			return true
+		})
+	}
+}
+
+func BenchmarkForEachService_InsideRLock(b *testing.B) {
+	r, err := NewServiceRegistry()
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	for i := 0; i < 1000; i++ {
+		r.addService(dummyServiceDescriptor{name: protoreflect.FullName(fmt.Sprintf("service_%d", i))})
+	}
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		r.lock.RLock()
+		for range r.services {
+			if !true {
+				break
+			}
+		}
+		r.lock.RUnlock()
+	}
+}
+
+func BenchmarkForEachService_Slice(b *testing.B) {
+	r, err := NewServiceRegistry()
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	for i := 0; i < 1000; i++ {
+		r.addService(dummyServiceDescriptor{name: protoreflect.FullName(fmt.Sprintf("service_%d", i))})
+	}
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		r.lock.RLock()
+		services := make([]protoreflect.ServiceDescriptor, 0, len(r.services))
+		for _, s := range r.services {
+			services = append(services, s)
+		}
+		r.lock.RUnlock()
+		for range services {
+			if !true {
+				break
+			}
+		}
+	}
+}