Make _has_response realization-specific for combined

src/ert/storage/local_ensemble.py

@@ -299,21 +299,39 @@ def _responses_exist_for_realization(
 
         if not self.experiment.response_configuration:
             return True
-        path = self._realization_dir(realization)
+
+        responses_for_all_reals: Dict[str, polars.DataFrame] = {}
+
+        _response_types = (
+            [self.experiment.response_key_to_response_type.get(key, key)]
+            if key
+            else list(self.experiment.response_configuration)
+        )
+
+        for response_type in _response_types:
+            responses_for_all_reals[response_type] = self.load_responses(
+                response_type, tuple(range(self.ensemble_size))
+            )
 
         # Note: potential performance bottleneck,
         # should be improved greatly by having statemap.
-        # Should also be faster due to lru cache on load_responses
-        def _has_response(_response_type: str) -> bool:
-            if (path / f"{_response_type}.parquet").exists():
-                return True
+        # This currently also relies on LRU cache on load_responses
+        # If it is removed, we should try to hold these datasets
+        # especially when we loop over all reals and invoke this function
+        if key and key not in responses_for_all_reals:
+
+            def _has_response(_response_type: str) -> bool:
+                return (
+                    realization
+                    in responses_for_all_reals[_response_type]["realization"]
+                    and key in responses_for_all_reals[_response_type]["response_key"]
+                )
+        else:
 
-            if (self.mount_point / f"{_response_type}.parquet").exists():
+            def _has_response(_response_type: str) -> bool:
                 return (
                     realization
-                    in self.load_responses(
-                        _response_type, tuple(range(self.ensemble_size))
-                    )["realization"]
+                    in responses_for_all_reals[_response_type]["realization"]
                 )
 
         if key: