diff --git a/pkg/api/testing/serialization_proto_test.go b/pkg/api/testing/serialization_proto_test.go
index 445a2916f81..9e90b3fc15a 100644
--- a/pkg/api/testing/serialization_proto_test.go
+++ b/pkg/api/testing/serialization_proto_test.go
@@ -25,7 +25,7 @@ import (
 	"testing"
 
 	"github.com/gogo/protobuf/proto"
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/apitesting/fuzzer"
 	apiequality "k8s.io/apimachinery/pkg/api/equality"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -165,6 +165,39 @@ func BenchmarkEncodeProtobufGeneratedMarshal(b *testing.B) {
 	b.StopTimer()
 }
 
+func BenchmarkEncodeProtobufGeneratedMarshalList10(b *testing.B) {
+	item := benchmarkItemsList(b, 10)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		if _, err := item.Marshal(); err != nil {
+			b.Fatal(err)
+		}
+	}
+	b.StopTimer()
+}
+
+func BenchmarkEncodeProtobufGeneratedMarshalList100(b *testing.B) {
+	item := benchmarkItemsList(b, 100)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		if _, err := item.Marshal(); err != nil {
+			b.Fatal(err)
+		}
+	}
+	b.StopTimer()
+}
+
+func BenchmarkEncodeProtobufGeneratedMarshalList1000(b *testing.B) {
+	item := benchmarkItemsList(b, 1000)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		if _, err := item.Marshal(); err != nil {
+			b.Fatal(err)
+		}
+	}
+	b.StopTimer()
+}
+
 // BenchmarkDecodeCodecToInternalProtobuf measures the cost of performing a codec decode,
 // including conversions and any type setting. This is a "full" decode.
 func BenchmarkDecodeCodecToInternalProtobuf(b *testing.B) {
diff --git a/pkg/api/testing/serialization_test.go b/pkg/api/testing/serialization_test.go
index 6d7bfc89997..e841f956f64 100644
--- a/pkg/api/testing/serialization_test.go
+++ b/pkg/api/testing/serialization_test.go
@@ -27,7 +27,7 @@ import (
 
 	jsoniter "github.com/json-iterator/go"
 	appsv1 "k8s.io/api/apps/v1"
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/apitesting/fuzzer"
 	"k8s.io/apimachinery/pkg/api/apitesting/roundtrip"
 	apiequality "k8s.io/apimachinery/pkg/api/equality"
@@ -424,6 +424,25 @@ func benchmarkItems(b *testing.B) []v1.Pod {
 	return items
 }
 
+func benchmarkItemsList(b *testing.B, numItems int) v1.PodList {
+	apiObjectFuzzer := fuzzer.FuzzerFor(FuzzerFuncs, rand.NewSource(benchmarkSeed), legacyscheme.Codecs)
+	items := make([]v1.Pod, numItems)
+	for i := range items {
+		var pod api.Pod
+		apiObjectFuzzer.Fuzz(&pod)
+		pod.Spec.InitContainers, pod.Status.InitContainerStatuses = nil, nil
+		out, err := legacyscheme.Scheme.ConvertToVersion(&pod, v1.SchemeGroupVersion)
+		if err != nil {
+			panic(err)
+		}
+		items[i] = *out.(*v1.Pod)
+	}
+
+	return v1.PodList{
+		Items: items,
+	}
+}
+
 // BenchmarkEncodeCodec measures the cost of performing a codec encode, which includes
 // reflection (to clear APIVersion and Kind)
 func BenchmarkEncodeCodec(b *testing.B) {