diff --git a/dataclasses_json/core.py b/dataclasses_json/core.py
index 35318d1b..a199abe2 100644
--- a/dataclasses_json/core.py
+++ b/dataclasses_json/core.py
@@ -45,6 +45,7 @@ def default(self, o) -> Json:
         return result
 
 
+@lru_cache(maxsize=128)
 def _user_overrides(cls):
     confs = ['encoder', 'decoder', 'mm_field', 'letter_case']
     FieldOverride = namedtuple('FieldOverride', confs)