diff --git a/validator.go b/validator.go
index 7cfcd4d..8a7e686 100644
--- a/validator.go
+++ b/validator.go
@@ -3,6 +3,7 @@ package validator
 import (
 	"fmt"
 	"reflect"
+	"strconv"
 )
 
 const (
@@ -20,6 +21,7 @@ type validate struct {
 	isPartial      bool
 	hasExcludes    bool
 	includeExclude map[string]struct{} // reset only if StructPartial or StructExcept are called, no need otherwise
+	misc           []byte
 
 	// StructLevel & FieldLevel fields
 	slflParent reflect.Value
@@ -203,13 +205,48 @@ OUTER:
 			switch kind {
 			case reflect.Slice, reflect.Array:
 
+				var nm string
+
+				// TODO: cache pool &cField
 				for i := 0; i < current.Len(); i++ {
-					v.traverseField(parent, current.Index(i), ns, structNs, &cField{Name: fmt.Sprintf(arrayIndexFieldName, cf.Name, i), AltName: fmt.Sprintf(arrayIndexFieldName, cf.AltName, i)}, ct)
+
+					v.misc = append(v.misc[0:0], cf.Name...)
+					v.misc = append(v.misc, '[')
+					v.misc = strconv.AppendInt(v.misc, int64(i), 10)
+					v.misc = append(v.misc, ']')
+
+					nm = string(v.misc)
+
+					v.misc = append(v.misc[0:0], cf.AltName...)
+					v.misc = append(v.misc, '[')
+					v.misc = strconv.AppendInt(v.misc, int64(i), 10)
+					v.misc = append(v.misc, ']')
+
+					v.traverseField(parent, current.Index(i), ns, structNs, &cField{Name: nm, AltName: string(v.misc)}, ct)
 				}
 
 			case reflect.Map:
+
+				var nm string
+				var pv string
+
 				for _, key := range current.MapKeys() {
-					v.traverseField(parent, current.MapIndex(key), ns, structNs, &cField{Name: fmt.Sprintf(mapIndexFieldName, cf.Name, key.Interface()), AltName: fmt.Sprintf(mapIndexFieldName, cf.AltName, key.Interface())}, ct)
+
+					pv = fmt.Sprintf("%v", key.Interface())
+
+					v.misc = append(v.misc[0:0], cf.Name...)
+					v.misc = append(v.misc, '[')
+					v.misc = append(v.misc, pv...)
+					v.misc = append(v.misc, ']')
+
+					nm = string(v.misc)
+
+					v.misc = append(v.misc[0:0], cf.AltName...)
+					v.misc = append(v.misc, '[')
+					v.misc = append(v.misc, pv...)
+					v.misc = append(v.misc, ']')
+
+					v.traverseField(parent, current.MapIndex(key), ns, structNs, &cField{Name: nm, AltName: string(v.misc)}, ct)
 				}
 
 			default:
@@ -222,7 +259,7 @@ OUTER:
 
 		case typeOr:
 
-			errTag := make([]byte, 0, 64)
+			v.misc = v.misc[0:0]
 
 			for {
 
@@ -248,8 +285,8 @@ OUTER:
 					}
 				}
 
-				errTag = append(errTag, '|')
-				errTag = append(errTag, ct.tag...)
+				v.misc = append(v.misc, '|')
+				v.misc = append(v.misc, ct.tag...)
 
 				if ct.next == nil {
 					// if we get here, no valid 'or' value and no more tags
@@ -275,8 +312,8 @@ OUTER:
 
 						v.errs = append(v.errs,
 							&fieldError{
-								tag:         string(errTag)[1:],
-								actualTag:   string(errTag)[1:],
+								tag:         string(v.misc)[1:],
+								actualTag:   string(v.misc)[1:],
 								ns:          string(append(ns, cf.AltName...)),
 								structNs:    string(append(structNs, cf.Name...)),
 								field:       cf.AltName,
diff --git a/validator_instance.go b/validator_instance.go
index 0e68290..1e6b53d 100644
--- a/validator_instance.go
+++ b/validator_instance.go
@@ -89,8 +89,11 @@ func New() *Validate {
 	v.pool = &sync.Pool{
 		New: func() interface{} {
 			return &validate{
-				v:    v,
-				errs: make(ValidationErrors, 0, 4),
+				v:        v,
+				errs:     make(ValidationErrors, 0, 4),
+				ns:       make([]byte, 0, 64),
+				actualNs: make([]byte, 0, 64),
+				misc:     make([]byte, 32),
 			}
 		},
 	}
@@ -209,9 +212,10 @@ func (v *Validate) Struct(s interface{}) (err error) {
 	vd.top = top
 	vd.isPartial = false
 	// vd.hasExcludes = false // only need to reset in StructPartial and StructExcept
-
 	vd.validateStruct(top, val, val.Type(), vd.ns[0:0], vd.actualNs[0:0], nil)
 
+	// fmt.Println(cap(vd.ns))
+
 	if len(vd.errs) > 0 {
 		err = vd.errs
 		vd.errs = nil
diff --git a/validator_test.go b/validator_test.go
index 7a8ce21..11817c6 100644
--- a/validator_test.go
+++ b/validator_test.go
@@ -237,7 +237,7 @@ func StructValidationTestStructSuccess(sl StructLevel) {
 	st := sl.Current().Interface().(TestStruct)
 
 	if st.String != "good value" {
-		sl.ReportError(reflect.ValueOf(st.String), "StringVal", "String", "badvalueteststruct")
+		sl.ReportError(st.String, "StringVal", "String", "badvalueteststruct")
 	}
 }
 
@@ -246,7 +246,7 @@ func StructValidationTestStruct(sl StructLevel) {
 	st := sl.Current().Interface().(TestStruct)
 
 	if st.String != "bad value" {
-		sl.ReportError(reflect.ValueOf(st.String), "StringVal", "String", "badvalueteststruct")
+		sl.ReportError(st.String, "StringVal", "String", "badvalueteststruct")
 	}
 }
 
@@ -255,7 +255,7 @@ func StructValidationNoTestStructCustomName(sl StructLevel) {
 	st := sl.Current().Interface().(TestStruct)
 
 	if st.String != "bad value" {
-		sl.ReportError(reflect.ValueOf(st.String), "String", "", "badvalueteststruct")
+		sl.ReportError(st.String, "String", "", "badvalueteststruct")
 	}
 }
 
@@ -264,7 +264,7 @@ func StructValidationTestStructInvalid(sl StructLevel) {
 	st := sl.Current().Interface().(TestStruct)
 
 	if st.String != "bad value" {
-		sl.ReportError(reflect.ValueOf(nil), "StringVal", "String", "badvalueteststruct")
+		sl.ReportError(nil, "StringVal", "String", "badvalueteststruct")
 	}
 }