Add support for attribute caching to ToggleEntity (#106272)

homeassistant/helpers/entity.py

@@ -1496,7 +1496,12 @@ class ToggleEntityDescription(EntityDescription, frozen_or_thawed=True):
     """A class that describes toggle entities."""
 
 
-class ToggleEntity(Entity):
+TOGGLE_ENTITY_CACHED_PROPERTIES_WITH_ATTR_ = {"is_on"}
+
+
+class ToggleEntity(
+    Entity, cached_properties=TOGGLE_ENTITY_CACHED_PROPERTIES_WITH_ATTR_
+):
     """An abstract class for entities that can be turned on and off."""
 
     entity_description: ToggleEntityDescription
@@ -1511,7 +1516,7 @@ class ToggleEntity(Entity):
             return None
         return STATE_ON if is_on else STATE_OFF
 
-    @property
+    @cached_property
     def is_on(self) -> bool | None:
         """Return True if entity is on."""
         return self._attr_is_on