diff --git a/info.go b/info.go
index b9f1a2b..19ea9c4 100644
--- a/info.go
+++ b/info.go
@@ -118,7 +118,10 @@ func (v VendorExtensible) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON for this extensible object
 func (v *VendorExtensible) UnmarshalJSON(data []byte) error {
-	var d map[string]interface{}
+	d := poolOfMaps.BorrowMap()
+	defer func() {
+		poolOfMaps.RedeemMap(d)
+	}()
 	if err := json.Unmarshal(data, &d); err != nil {
 		return err
 	}
diff --git a/ref.go b/ref.go
index eadf635..96fa345 100644
--- a/ref.go
+++ b/ref.go
@@ -145,7 +145,10 @@ func (r Ref) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON unmarshals this ref from a JSON object
 func (r *Ref) UnmarshalJSON(d []byte) error {
-	var v map[string]interface{}
+	v := poolOfMaps.BorrowMap()
+	defer func() {
+		poolOfMaps.RedeemMap(v)
+	}()
 	if err := json.Unmarshal(d, &v); err != nil {
 		return err
 	}
@@ -154,7 +157,7 @@ func (r *Ref) UnmarshalJSON(d []byte) error {
 
 // GobEncode provides a safe gob encoder for Ref
 func (r Ref) GobEncode() ([]byte, error) {
-	var b bytes.Buffer
+	var b bytes.Buffer // TODO: grow
 	raw, err := r.MarshalJSON()
 	if err != nil {
 		return nil, err
@@ -165,7 +168,7 @@ func (r Ref) GobEncode() ([]byte, error) {
 
 // GobDecode provides a safe gob decoder for Ref
 func (r *Ref) GobDecode(b []byte) error {
-	var raw []byte
+	var raw []byte // TODO
 	buf := bytes.NewBuffer(b)
 	err := gob.NewDecoder(buf).Decode(&raw)
 	if err != nil {
diff --git a/responses.go b/responses.go
index ecc5aec..8a67116 100644
--- a/responses.go
+++ b/responses.go
@@ -97,7 +97,7 @@ type ResponsesProps struct {
 
 // MarshalJSON marshals responses as JSON
 func (r ResponsesProps) MarshalJSON() ([]byte, error) {
-	toser := map[string]Response{}
+	toser := make(map[string]Response, len(r.StatusCodeResponses)+1)
 	if r.Default != nil {
 		toser["default"] = *r.Default
 	}
diff --git a/schema.go b/schema.go
index 92e71c3..f845f7a 100644
--- a/schema.go
+++ b/schema.go
@@ -614,7 +614,6 @@ func (s *Schema) UnmarshalJSON(data []byte) error {
 		SwaggerSchemaProps: props.SwaggerSchemaProps,
 	}
 
-	//var d map[string]interface{}
 	d := poolOfMaps.BorrowMap()
 	defer func() {
 		poolOfMaps.RedeemMap(d)