diff --git a/crates/serde_valid/src/features/fluent/localize.rs b/crates/serde_valid/src/features/fluent/localize.rs
index 8fdf01b..d2cd352 100644
--- a/crates/serde_valid/src/features/fluent/localize.rs
+++ b/crates/serde_valid/src/features/fluent/localize.rs
@@ -89,7 +89,7 @@ impl Localize for PropertyErrorsMap<crate::validation::Error> {
         M: fluent::memoizer::MemoizerKind,
     {
         self.iter()
-            .map(|(property, error)| (property.to_string(), error.localize(bundle)))
+            .map(|(property, error)| ((*property).clone(), error.localize(bundle)))
             .collect()
     }
 }
diff --git a/crates/serde_valid/src/lib.rs b/crates/serde_valid/src/lib.rs
index be26578..dc6fcce 100644
--- a/crates/serde_valid/src/lib.rs
+++ b/crates/serde_valid/src/lib.rs
@@ -586,7 +586,7 @@ pub use error::{
 #[allow(unused_imports)]
 pub use features::*;
 use indexmap::IndexMap;
-use std::collections::HashMap;
+use std::{borrow::Cow, collections::HashMap};
 pub use validation::{
     ValidateEnumerate, ValidateExclusiveMaximum, ValidateExclusiveMinimum, ValidateMaxItems,
     ValidateMaxLength, ValidateMaxProperties, ValidateMaximum, ValidateMinItems, ValidateMinLength,
@@ -661,7 +661,7 @@ where
 
         for (key, value) in self.iter() {
             if let Err(errors) = value.validate() {
-                items.insert(key.into(), errors);
+                items.insert(Cow::from(key.into()), errors);
             }
         }
 
@@ -685,7 +685,7 @@ where
 
         for (key, value) in self.iter() {
             if let Err(errors) = value.validate() {
-                items.insert(key.into(), errors);
+                items.insert(Cow::from(key.into()), errors);
             }
         }
 
diff --git a/crates/serde_valid/src/validation/error.rs b/crates/serde_valid/src/validation/error.rs
index fe6c42c..dfd87a5 100644
--- a/crates/serde_valid/src/validation/error.rs
+++ b/crates/serde_valid/src/validation/error.rs
@@ -5,6 +5,8 @@ mod into_error;
 mod message;
 mod object_errors;
 
+use std::borrow::Cow;
+
 pub use crate::error::{
     EnumerateError, ExclusiveMaximumError, ExclusiveMinimumError, MaxItemsError, MaxLengthError,
     MaxPropertiesError, MaximumError, MinItemsError, MinLengthError, MinPropertiesError,
@@ -104,5 +106,5 @@ where
 pub type VecErrors<E = crate::validation::Error> = Vec<E>;
 pub type ItemErrorsMap<E> = IndexMap<usize, Errors<E>>;
 pub type ItemVecErrorsMap<E> = IndexMap<usize, VecErrors<E>>;
-pub type PropertyErrorsMap<E> = IndexMap<String, Errors<E>>;
-pub type PropertyVecErrorsMap<E> = IndexMap<String, VecErrors<E>>;
+pub type PropertyErrorsMap<E> = IndexMap<Cow<'static, str>, Errors<E>>;
+pub type PropertyVecErrorsMap<E> = IndexMap<Cow<'static, str>, VecErrors<E>>;
diff --git a/crates/serde_valid_derive/src/serde/rename.rs b/crates/serde_valid_derive/src/serde/rename.rs
index b901600..429a58a 100644
--- a/crates/serde_valid_derive/src/serde/rename.rs
+++ b/crates/serde_valid_derive/src/serde/rename.rs
@@ -15,7 +15,7 @@ pub fn collect_serde_rename_map(fields: &syn::FieldsNamed) -> RenameMap {
                 if let Some(rename) = find_rename_from_serde_attributes(attribute) {
                     renames.insert(
                         field.ident.to_token_stream().to_string(),
-                        quote!(#rename.to_string()),
+                        quote!(std::borrow::Cow::from(#rename)),
                     );
                 }
             }
diff --git a/crates/serde_valid_derive/src/types/field/named.rs b/crates/serde_valid_derive/src/types/field/named.rs
index 1ccbd22..a7e47c0 100644
--- a/crates/serde_valid_derive/src/types/field/named.rs
+++ b/crates/serde_valid_derive/src/types/field/named.rs
@@ -33,7 +33,7 @@ impl Field for NamedField<'_> {
 
     fn key(&self) -> proc_macro2::TokenStream {
         let name = &self.name;
-        quote!(#name.to_string())
+        quote!(std::borrow::Cow::from(#name))
     }
 
     fn errors_variable(&self) -> proc_macro2::TokenStream {