diff --git a/README.md b/README.md
index 60a6ffe..394bc00 100644
--- a/README.md
+++ b/README.md
@@ -58,6 +58,9 @@ func main() {
 
 ## Release Note
 
+### v1.0.1
+- Perception/ExtPerception hash creation times are reduced
+
 ### v1.0.0
 **IMPORTANT** 
 goimagehash v1.0.0 does not have compatible with the before version for future features
diff --git a/hashcompute_test.go b/hashcompute_test.go
index 575d84d..83711a9 100644
--- a/hashcompute_test.go
+++ b/hashcompute_test.go
@@ -98,7 +98,7 @@ func TestHashCompute(t *testing.T) {
 	}
 }
 
-func NilHashComputeTest(t *testing.T) {
+func TestNilHashCompute(t *testing.T) {
 	hash, err := AverageHash(nil)
 	if err == nil {
 		t.Errorf("Error should be got.")
@@ -124,6 +124,40 @@ func NilHashComputeTest(t *testing.T) {
 	}
 }
 
+func TestNilExtendHashCompute(t *testing.T) {
+	hash, err := ExtAverageHash(nil, 8, 8)
+	if err == nil {
+		t.Errorf("Error should be got.")
+	}
+	if hash != nil {
+		t.Errorf("Nil hash should be got. but got %v", hash)
+	}
+
+	hash, err = ExtDifferenceHash(nil, 8, 8)
+	if err == nil {
+		t.Errorf("Error should be got.")
+	}
+	if hash != nil {
+		t.Errorf("Nil hash should be got. but got %v", hash)
+	}
+
+	hash, err = ExtPerceptionHash(nil, 8, 8)
+	if err == nil {
+		t.Errorf("Error should be got.")
+	}
+	if hash != nil {
+		t.Errorf("Nil hash should be got. but got %v", hash)
+	}
+
+	hash, err = ExtPerceptionHash(nil, 8, 9)
+	if err == nil {
+		t.Errorf("Error should be got.")
+	}
+	if hash != nil {
+		t.Errorf("Nil hash should be got. but got %v", hash)
+	}
+}
+
 func BenchmarkDistanceIdentical(b *testing.B) {
 	h1 := &ImageHash{hash: 0xe48ae53c05e502f7}
 	h2 := &ImageHash{hash: 0xe48ae53c05e502f7}
@@ -295,3 +329,39 @@ func BenchmarkPerceptionHash(b *testing.B) {
 		}
 	}
 }
+
+func BenchmarkAverageHash(b *testing.B) {
+	file1, err := os.Open("_examples/sample3.jpg")
+	if err != nil {
+		b.Errorf("%s", err)
+	}
+	defer file1.Close()
+	img1, err := jpeg.Decode(file1)
+	if err != nil {
+		b.Errorf("%s", err)
+	}
+	for i := 0; i < b.N; i++ {
+		_, err := ExtAverageHash(img1, 8, 8)
+		if err != nil {
+			b.Errorf("%s", err)
+		}
+	}
+}
+
+func BenchmarkDiffrenceHash(b *testing.B) {
+	file1, err := os.Open("_examples/sample3.jpg")
+	if err != nil {
+		b.Errorf("%s", err)
+	}
+	defer file1.Close()
+	img1, err := jpeg.Decode(file1)
+	if err != nil {
+		b.Errorf("%s", err)
+	}
+	for i := 0; i < b.N; i++ {
+		_, err := ExtDifferenceHash(img1, 8, 8)
+		if err != nil {
+			b.Errorf("%s", err)
+		}
+	}
+}