diff --git a/README.md b/README.md
index 27a5f3e0..3b50dab1 100644
--- a/README.md
+++ b/README.md
@@ -735,6 +735,8 @@ db.Where("email = ?", "x@example.org").Attrs(User{RegisteredIp: "111.111.111.111
 ```
 
 ## TODO
+* Rows, Row
+* Cache Stmt for performance
 * Join, Having, Group, Includes
 * Scopes, Valiations
 * AlertColumn, DropColumn, AddIndex, RemoveIndex
diff --git a/field.go b/field.go
index 8455c184..16016c34 100644
--- a/field.go
+++ b/field.go
@@ -107,7 +107,7 @@ func parseSqlTag(str string) (typ string, addational_typ string, size int) {
 		m := make(map[string]string)
 		for _, value := range tags {
 			v := strings.Split(value, ":")
-			k := strings.Trim(strings.ToUpper(v[0]), " ")
+			k := strings.TrimSpace(strings.ToUpper(v[0]))
 			if len(v) == 2 {
 				m[k] = v[1]
 			} else {
diff --git a/gorm_test.go b/gorm_test.go
index 38ec2b54..54c4c49e 100644
--- a/gorm_test.go
+++ b/gorm_test.go
@@ -1365,7 +1365,7 @@ func TestQueryChain(t *testing.T) {
 }
 
 func BenchmarkGorm(b *testing.B) {
-	b.N = 2000
+	b.N = 5000
 	for x := 0; x < b.N; x++ {
 		e := strconv.Itoa(x) + "benchmark@example.org"
 		email := BigEmail{Email: e, UserAgent: "pc", RegisteredAt: time.Now()}
@@ -1388,7 +1388,7 @@ func BenchmarkRawSql(b *testing.B) {
 	update_sql := "UPDATE emails SET email = $1, updated_at = $2 WHERE id = $3"
 	delete_sql := "DELETE FROM orders WHERE id = $1"
 
-	b.N = 2000
+	b.N = 5000
 	for x := 0; x < b.N; x++ {
 		var id int64
 		e := strconv.Itoa(x) + "benchmark@example.org"
diff --git a/model.go b/model.go
index 0bb29e84..a9f7440e 100644
--- a/model.go
+++ b/model.go
@@ -40,10 +40,6 @@ func (m *Model) primaryKeyDb() string {
 }
 
 func (m *Model) fields(operation string) (fields []*Field) {
-	if len(m._cache_fields[operation]) > 0 {
-		return m._cache_fields[operation]
-	}
-
 	indirect_value := m.reflectData()
 	if !indirect_value.IsValid() {
 		return
@@ -79,14 +75,10 @@ func (m *Model) fields(operation string) (fields []*Field) {
 			field.structField = p
 			field.reflectValue = value
 			field.Value = value.Interface()
+			field.parseAssociation()
 			fields = append(fields, &field)
 		}
 	}
-
-	if len(m._cache_fields) == 0 {
-		m._cache_fields = map[string][]*Field{}
-	}
-	m._cache_fields[operation] = fields
 	return
 }
 
@@ -225,7 +217,6 @@ func (m *Model) setValueByColumn(name string, value interface{}, out interface{}
 
 func (m *Model) beforeAssociations() (fields []*Field) {
 	for _, field := range m.fields("null") {
-		field.parseAssociation()
 		if field.beforeAssociation && !field.isBlank() {
 			fields = append(fields, field)
 		}
diff --git a/utils.go b/utils.go
index d4897c13..0d0b48fd 100644
--- a/utils.go
+++ b/utils.go
@@ -10,18 +10,37 @@ import (
 	"time"
 )
 
-func toSnake(s string) string {
+var toSnakeMap map[string]string
+var toUpperMap map[string]string
+
+func init() {
+	toSnakeMap = map[string]string{}
+	toUpperMap = map[string]string{}
+}
+
+func toSnake(u string) string {
+	if v := toSnakeMap[u]; v != "" {
+		return v
+	}
+
 	buf := bytes.NewBufferString("")
-	for i, v := range s {
+	for i, v := range u {
 		if i > 0 && v >= 'A' && v <= 'Z' {
 			buf.WriteRune('_')
 		}
 		buf.WriteRune(v)
 	}
-	return strings.ToLower(buf.String())
+
+	s := strings.ToLower(buf.String())
+	toSnakeMap[u] = s
+	return s
 }
 
 func snakeToUpperCamel(s string) string {
+	if v := toUpperMap[s]; v != "" {
+		return v
+	}
+
 	buf := bytes.NewBufferString("")
 	for _, v := range strings.Split(s, "_") {
 		if len(v) > 0 {
@@ -29,7 +48,10 @@ func snakeToUpperCamel(s string) string {
 			buf.WriteString(v[1:])
 		}
 	}
-	return buf.String()
+
+	u := buf.String()
+	toUpperMap[s] = u
+	return u
 }
 
 func toSearchableMap(attrs ...interface{}) (result interface{}) {