diff --git a/naive/naive_test.go b/naive/naive_test.go
index 1b35ef9..b0a9cd3 100644
--- a/naive/naive_test.go
+++ b/naive/naive_test.go
@@ -56,3 +56,53 @@ func BenchmarkBind9(b *testing.B) {
 		}
 	})
 }
+
+func BenchmarkSeq5(b *testing.B) {
+	type P = gigaparsec.Parser[byte, byte]
+	type Seq5T = func(P, P, P, P, P, func(byte, byte, byte, byte, byte) byte) P
+
+	zero := gigaparsec.Return[byte, byte](0)
+
+	f := func(a, b, c, d, e byte) byte {
+		return a + b + c + d + e
+	}
+	p := func(seq5 Seq5T) P {
+		return seq5(zero, zero, zero, zero, zero, f)
+	}
+	input := gigaparsec.SliceReaderAt[byte]{0}
+	b.Run("gigaparsec.Seq5", func(b *testing.B) {
+		for range b.N {
+			gigaparsec.Run(p(gigaparsec.Seq5), input)
+		}
+	})
+	b.Run("naive.Seq5", func(b *testing.B) {
+		for range b.N {
+			gigaparsec.Run(p(naive.Seq5), input)
+		}
+	})
+}
+
+func BenchmarkSeq9(b *testing.B) {
+	type P = gigaparsec.Parser[byte, byte]
+	type Seq9T = func(P, P, P, P, P, P, P, P, P, func(byte, byte, byte, byte, byte, byte, byte, byte, byte) byte) P
+
+	zero := gigaparsec.Return[byte, byte](0)
+
+	f := func(a, b, c, d, e, f, g, h, i byte) byte {
+		return a + b + c + d + e + f + g + h + i
+	}
+	p := func(seq9 Seq9T) P {
+		return seq9(zero, zero, zero, zero, zero, zero, zero, zero, zero, f)
+	}
+	input := gigaparsec.SliceReaderAt[byte]{0}
+	b.Run("gigaparsec.Seq9", func(b *testing.B) {
+		for range b.N {
+			gigaparsec.Run(p(gigaparsec.Seq9), input)
+		}
+	})
+	b.Run("naive.Seq9", func(b *testing.B) {
+		for range b.N {
+			gigaparsec.Run(p(naive.Seq9), input)
+		}
+	})
+}