diff --git a/cimsparql/parse_xml.py b/cimsparql/parse_xml.py
index 4f674b8e..537c49c6 100644
--- a/cimsparql/parse_xml.py
+++ b/cimsparql/parse_xml.py
@@ -1,6 +1,7 @@
 import collections
 import gzip
 import re
+from functools import cached_property
 from pathlib import Path
 from typing import Callable, Dict, Iterable, List, Optional, Tuple, Union
 from zipfile import ZipFile
@@ -319,20 +320,23 @@ def __str__(self) -> str:
         file_desc = ", ".join([f"{profile}: {path.stem}" for profile, path in self.paths.items()])
         return f"<SvTpCimXml object, {file_desc}>"
 
-    @property
+    @cached_property
     def voltage(self) -> pd.DataFrame:
         return self._parser["sv"].parse("SvVoltage").set_index("mrid")
 
-    @property
+    @cached_property
     def tap_steps(self) -> pd.DataFrame:
         return self._parser["sv"].parse("SvTapStep").set_index("mrid")
 
+    @cached_property
     def bus_data(self, *args, **kwargs) -> pd.DataFrame:
         return self._parser["tp"].parse("TopologicalNode").set_index("mrid")
 
+    @cached_property
     def terminal(self, *args, **kwargs) -> pd.DataFrame:
         return self._parser["tp"].parse("Terminal").set_index("mrid")
 
+    @cached_property
     def powerflow(self, *args, **kwargs) -> pd.DataFrame:
         return self._parser["sv"].parse("SvPowerFlow").set_index("mrid")
 
diff --git a/tests/test_parse_xml.py b/tests/test_parse_xml.py
index b42f3c9f..12cc4de5 100644
--- a/tests/test_parse_xml.py
+++ b/tests/test_parse_xml.py
@@ -34,7 +34,7 @@ def sv_tp_cim(profiles: List[str]) -> SvTpCimXml:
 
 @pytest.fixture(scope="module")
 def bus_data(sv_tp_cim) -> pd.DataFrame:
-    return sv_tp_cim.bus_data()
+    return sv_tp_cim.bus_data
 
 
 @pytest.fixture(scope="module")
@@ -57,25 +57,22 @@ def test_parse_sv_tp_cim_xml_bus_data(bus_data: pd.DataFrame):
 
 
 def test_parse_sv_tp_cim_xml_terminal(sv_tp_cim: SvTpCimXml):
-    assert sv_tp_cim.terminal().shape == (4, 2)
+    assert sv_tp_cim.terminal.shape == (4, 2)
 
 
 def test_parse_sv_tp_cim_xml_powerflow(sv_tp_cim: SvTpCimXml):
-    powerflow = sv_tp_cim.powerflow()
-    assert powerflow.shape == (4, 2)
-    assert (powerflow.dtypes == float).all()
+    assert sv_tp_cim.powerflow.shape == (4, 2)
+    assert (sv_tp_cim.powerflow.dtypes == float).all()
 
 
 def test_parse_sv_tp_cim_xml_voltage(sv_tp_cim: SvTpCimXml):
-    voltage = sv_tp_cim.voltage
-    assert voltage.shape == (4, 2)
-    assert (voltage.dtypes == float).all()
+    assert sv_tp_cim.voltage.shape == (4, 2)
+    assert (sv_tp_cim.voltage.dtypes == float).all()
 
 
 def test_parse_sv_tp_cim_xml_tap_step(sv_tp_cim: SvTpCimXml):
-    tap_steps = sv_tp_cim.tap_steps
-    assert tap_steps.shape == (4, 1)
-    assert (tap_steps.dtypes == int).all()
+    assert sv_tp_cim.tap_steps.shape == (4, 1)
+    assert (sv_tp_cim.tap_steps.dtypes == int).all()
 
 
 def test_parse_cim_file():