diff --git a/bench_test.go b/bench_test.go
new file mode 100644
index 0000000..01b5bb1
--- /dev/null
+++ b/bench_test.go
@@ -0,0 +1,172 @@
+package fixedwidth
+
+import (
+	"bytes"
+	"testing"
+)
+
+type mixedData struct {
+	F1  string   `fixed:"1,10"`
+	F2  *string  `fixed:"11,20"`
+	F3  int64    `fixed:"21,30"`
+	F4  *int64   `fixed:"31,40"`
+	F5  int32    `fixed:"41,50"`
+	F6  *int32   `fixed:"51,60"`
+	F7  int16    `fixed:"61,70"`
+	F8  *int16   `fixed:"71,80"`
+	F9  int8     `fixed:"81,90"`
+	F10 *int8    `fixed:"91,100"`
+	F11 float64  `fixed:"101,110"`
+	F12 *float64 `fixed:"111,120"`
+	F13 float32  `fixed:"121,130"`
+	//F14 *float32 `fixed:"131,140"`
+}
+
+var mixedDataInstance = mixedData{"foo", stringp("foo"), 42, int64p(42), 42, int32p(42), 42, int16p(42), 42, int8p(42), 4.2, float64p(4.2), 4.2} //,float32p(4.2)}
+
+func BenchmarkUnmarshal_MixedData_1(b *testing.B) {
+	data := []byte(`       foo       foo        42        42        42        42        42        42        42        42       4.2       4.2       4.2       4.2`)
+	var v mixedData
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_ = Unmarshal(data, &v)
+	}
+}
+
+func BenchmarkUnmarshal_MixedData_1000(b *testing.B) {
+	data := bytes.Repeat([]byte(`       foo       foo        42        42        42        42        42        42        42        42       4.2       4.2       4.2       4.2`+"\n"), 100)
+	var v []mixedData
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_ = Unmarshal(data, &v)
+	}
+}
+
+func BenchmarkUnmarshal_MixedData_100000(b *testing.B) {
+	data := bytes.Repeat([]byte(`       foo       foo        42        42        42        42        42        42        42        42       4.2       4.2       4.2       4.2`+"\n"), 10000)
+	var v []mixedData
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_ = Unmarshal(data, &v)
+	}
+}
+
+func BenchmarkUnmarshal_String(b *testing.B) {
+	data := []byte(`foo       `)
+	var v struct {
+		F1 string `fixed:"1,10"`
+	}
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_ = Unmarshal(data, &v)
+	}
+}
+
+func BenchmarkUnmarshal_StringPtr(b *testing.B) {
+	data := []byte(`foo       `)
+	var v struct {
+		F1 *string `fixed:"1,10"`
+	}
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_ = Unmarshal(data, &v)
+	}
+}
+
+func BenchmarkUnmarshal_Int64(b *testing.B) {
+	data := []byte(`42       `)
+	var v struct {
+		F1 int64 `fixed:"1,10"`
+	}
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_ = Unmarshal(data, &v)
+	}
+}
+
+func BenchmarkUnmarshal_Float64(b *testing.B) {
+	data := []byte(`4.2      `)
+	var v struct {
+		F1 float64 `fixed:"1,10"`
+	}
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_ = Unmarshal(data, &v)
+	}
+}
+
+func BenchmarkMarshal_MixedData_1(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		Marshal(mixedDataInstance)
+	}
+}
+
+func BenchmarkMarshal_MixedData_1000(b *testing.B) {
+	v := make([]mixedData, 1000)
+	for i := range v {
+		v[i] = mixedDataInstance
+	}
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Marshal(v)
+	}
+}
+
+func BenchmarkMarshal_MixedData_100000(b *testing.B) {
+	v := make([]mixedData, 100000)
+	for i := range v {
+		v[i] = mixedDataInstance
+	}
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Marshal(v)
+	}
+}
+
+func BenchmarkMarshal_String(b *testing.B) {
+	v := struct {
+		F1 string `fixed:"1,10"`
+	}{
+		F1: "foo",
+	}
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Marshal(v)
+	}
+}
+
+func BenchmarkMarshal_StringPtr(b *testing.B) {
+	v := struct {
+		F1 *string `fixed:"1,10"`
+	}{
+		F1: stringp("foo"),
+	}
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Marshal(v)
+	}
+}
+
+func BenchmarkMarshal_Int64(b *testing.B) {
+	v := struct {
+		F1 int64 `fixed:"1,10"`
+	}{
+		F1: 42,
+	}
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Marshal(v)
+	}
+}
+
+func BenchmarkMarshal_Float64(b *testing.B) {
+	v := struct {
+		F1 float64 `fixed:"1,10"`
+	}{
+		F1: 4.2,
+	}
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Marshal(v)
+	}
+}
diff --git a/fixedwidth_test.go b/fixedwidth_test.go
index de51609..afd6217 100644
--- a/fixedwidth_test.go
+++ b/fixedwidth_test.go
@@ -10,6 +10,10 @@ var (
 func float64p(v float64) *float64 { return &v }
 func float32p(v float32) *float32 { return &v }
 func intp(v int) *int             { return &v }
+func int64p(v int64) *int64       { return &v }
+func int32p(v int32) *int32       { return &v }
+func int16p(v int16) *int16       { return &v }
+func int8p(v int8) *int8          { return &v }
 func stringp(v string) *string    { return &v }
 
 // EncodableString is a string that implements the encoding TextUnmarshaler and TextMarshaler interface.