diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4dadc01..8172e0f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,8 @@
 
 ## Dessine-moi 25.2.0 (*upcoming release*)
 
+- Cache registered type list ({ghpr}`12`).
+
 ## Dessine-moi 25.1.0 (2025-06-25)
 
 - *Dessine-moi* is now on conda-forge.
diff --git a/src/dessinemoi/_core.py b/src/dessinemoi/_core.py
index 3db42dc..45bac4e 100644
--- a/src/dessinemoi/_core.py
+++ b/src/dessinemoi/_core.py
@@ -140,6 +140,8 @@ class Factory:
        ``Dict[str, FactoryRegistryEntry]``.
     """
 
+    _registered_types: Optional[List[str]] = attrs.field(default=None, repr=False)
+
     @property
     def registered_types(self) -> List[str]:
         """
@@ -147,7 +149,11 @@ def registered_types(self) -> List[str]:
 
         .. versionadded:: 21.3.0
         """
-        return list({_fullname(x.cls) for x in self.registry.values()})
+        if self._registered_types is None:
+            self._registered_types = list(
+                {_fullname(x.cls) for x in self.registry.values()}
+            )
+        return self._registered_types
 
     def _register_impl(
         self,
@@ -161,6 +167,9 @@ def _register_impl(
         if isinstance(cls, str):
             cls = LazyType.from_str(cls)
 
+        # Invalidate registered type cache
+        self._registered_types = None
+
         # Upon request, force eager loading of lazy type declarations
         if isinstance(cls, LazyType) and not allow_lazy:
             cls = cls.load()