diff --git a/src/ifctester/ifctester/facet.py b/src/ifctester/ifctester/facet.py
index 5e20f84524..d10664fee2 100644
--- a/src/ifctester/ifctester/facet.py
+++ b/src/ifctester/ifctester/facet.py
@@ -21,6 +21,7 @@ import builtins
 import ifcopenshell.util.unit
 import ifcopenshell.util.element
 import ifcopenshell.util.classification
+from functools import lru_cache
 from xmlschema.validators import identities
 
 
@@ -41,6 +42,16 @@ def cast_to_value(from_value, to_value):
         pass
 
 
+@lru_cache
+def get_pset(element, pset):
+    return ifcopenshell.util.element.get_pset(element, pset)
+
+
+@lru_cache
+def get_psets(element, pset):
+    return ifcopenshell.util.element.get_psets(element)
+
+
 class Facet:
     def __init__(self, *parameters):
         self.status = None
@@ -591,10 +602,10 @@ class Property(Facet):
             return PropertyResult(True)
 
         if isinstance(self.propertySet, str):
-            pset = ifcopenshell.util.element.get_pset(inst, self.propertySet)
+            pset = get_pset(inst, self.propertySet)
             psets = {self.propertySet: pset} if pset else {}
         else:
-            all_psets = ifcopenshell.util.element.get_psets(inst)
+            all_psets = get_psets(inst)
             psets = {k: v for k, v in all_psets.items() if k == self.propertySet}
 
         is_pass = bool(psets)
diff --git a/src/ifctester/ifctester/ids.py b/src/ifctester/ifctester/ids.py
index c4766259bb..e57eca7048 100644
--- a/src/ifctester/ifctester/ids.py
+++ b/src/ifctester/ifctester/ids.py
@@ -21,7 +21,7 @@ import datetime
 from xmlschema import XMLSchema
 from xmlschema import etree_tostring
 from xml.etree import ElementTree as ET
-from .facet import Entity, Attribute, Classification, Property, PartOf, Material, Restriction
+from .facet import Entity, Attribute, Classification, Property, PartOf, Material, Restriction, get_pset, get_psets
 
 
 cwd = os.path.dirname(os.path.realpath(__file__))
@@ -113,6 +113,8 @@ class Ids:
         return get_schema().is_valid(filepath)
 
     def validate(self, ifc_file, filter_version=False):
+        get_pset.cache_clear()
+        get_psets.cache_clear()
         for specification in self.specifications:
             specification.reset_status()
             specification.validate(ifc_file, filter_version=filter_version)