diff --git a/queue/sender_test.go b/queue/sender_test.go
index 300a50c..fe54bab 100644
--- a/queue/sender_test.go
+++ b/queue/sender_test.go
@@ -1,9 +1,12 @@
 package queue
 
 import (
+	"io"
+	"math/rand/v2"
 	"testing"
 
 	"github.com/go-json-experiment/json"
+	"github.com/go-json-experiment/json/jsontext"
 )
 
 func TestSenderUnique(t *testing.T) {
@@ -37,3 +40,47 @@ func TestSenderRoundTrip(t *testing.T) {
 		t.Errorf("round-trip failed:\nwant %v\ngot  %v", want, got)
 	}
 }
+
+func BenchmarkSenderEncode(b *testing.B) {
+	enc := jsontext.NewEncoder(io.Discard)
+	opts := []*sender{ // pointers to avoid allocations
+		ref(Sender([]byte("nijika"), "kessoku", "bocchi")),
+		ref(Sender([]byte("kita"), "kessoku", "bocchi")),
+		ref(Sender([]byte("nijika"), "sickhack", "bocchi")),
+		ref(Sender([]byte("nijika"), "kessoku", "ryō")),
+		ref(Sender([]byte("nijika"), "kessoku", "bocchi2")),
+		ref(Sender([]byte("kita"), "kessoku", "bocchi2")),
+		ref(Sender([]byte("nijika"), "sickhack", "bocchi2")),
+		ref(Sender([]byte("nijika"), "kessoku", "ryō2")),
+	}
+	b.ReportAllocs()
+	for b.Loop() {
+		json.MarshalEncode(enc, opts[rand.IntN(len(opts))])
+	}
+}
+
+func BenchmarkSenderDecode(b *testing.B) {
+	opts := [][]byte{
+		must(json.Marshal(Sender([]byte("nijika"), "kessoku", "bocchi"))),
+		must(json.Marshal(Sender([]byte("kita"), "kessoku", "bocchi"))),
+		must(json.Marshal(Sender([]byte("nijika"), "sickhack", "bocchi"))),
+		must(json.Marshal(Sender([]byte("nijika"), "kessoku", "ryō"))),
+		must(json.Marshal(Sender([]byte("nijika"), "kessoku", "bocchi2"))),
+		must(json.Marshal(Sender([]byte("kita"), "kessoku", "bocchi2"))),
+		must(json.Marshal(Sender([]byte("nijika"), "sickhack", "bocchi2"))),
+		must(json.Marshal(Sender([]byte("nijika"), "kessoku", "ryō2"))),
+	}
+	b.ReportAllocs()
+	var v sender
+	for b.Loop() {
+		json.Unmarshal(opts[rand.IntN(len(opts))], &v)
+	}
+}
+
+func ref[T any](x T) *T { return &x }
+func must[T any](x T, err error) T {
+	if err != nil {
+		panic(err)
+	}
+	return x
+}