diff --git a/elementary/monitor/data_monitoring/schema.py b/elementary/monitor/data_monitoring/schema.py
index 315886a42..c427ac53b 100644
--- a/elementary/monitor/data_monitoring/schema.py
+++ b/elementary/monitor/data_monitoring/schema.py
@@ -1,6 +1,7 @@
 import re
 from datetime import datetime
 from enum import Enum
+from functools import cached_property
 from typing import Any, Generic, Iterable, List, Optional, Pattern, Set, Tuple, TypeVar
 
 from elementary.utils.log import get_logger
@@ -49,23 +50,12 @@ def normalized_status(self) -> List[Status]:
         return [Status(status) for status in self.statuses if status in list(Status)]
 
 
-def apply_filter(filter_type: FilterType, value: Any, filter_value: Any) -> bool:
-    if filter_type == FilterType.IS:
-        return value == filter_value
-    elif filter_type == FilterType.IS_NOT:
-        return value != filter_value
-    elif filter_type == FilterType.CONTAINS:
-        return str(filter_value).lower() in str(value).lower()
-    elif filter_type == FilterType.NOT_CONTAINS:
-        return str(filter_value).lower() not in str(value).lower()
-    raise ValueError(f"Unsupported filter type: {filter_type}")
-
-
 ValueT = TypeVar("ValueT")
 
 
 ANY_OPERATORS = [FilterType.IS, FilterType.CONTAINS]
 ALL_OPERATORS = [FilterType.IS_NOT, FilterType.NOT_CONTAINS]
+NEGATIVE_OPERATORS = [FilterType.IS_NOT, FilterType.NOT_CONTAINS]
 
 
 class FilterSchema(BaseModel, Generic[ValueT]):
@@ -77,42 +67,62 @@ class Config:
         # Make sure that serializing Enum return values
         use_enum_values = True
 
-    def _apply_filter_type(self, value: ValueT, filter_value: ValueT) -> bool:
-        return apply_filter(self.type, value, filter_value)
+    @staticmethod
+    def normalize_value(value: Any) -> str:
+        if isinstance(value, Enum):
+            return str(value.value).lower()
+        return str(value).lower()
 
-    def apply_filter_on_value(self, value: ValueT) -> bool:
-        if self.type in ANY_OPERATORS:
-            return any(
-                self._apply_filter_type(value, filter_value)
-                for filter_value in self.values
+    @staticmethod
+    def normalize_values(values: Iterable[ValueT]) -> Set[str]:
+        return {FilterSchema.normalize_value(value) for value in values}
+
+    @cached_property
+    def _normalized_values(self) -> Set[str]:
+        return FilterSchema.normalize_values(self.values)
+
+    def get_matching_normalized_values(self, values: Set[str]) -> Set[str]:
+        if self.type == FilterType.IS:
+            return values.intersection(self._normalized_values)
+        elif self.type == FilterType.IS_NOT:
+            matching_values = values.difference(self._normalized_values)
+            if len(matching_values) != len(values):
+                return set()
+            return matching_values
+        if self.type == FilterType.CONTAINS:
+            return set(
+                value
+                for value in values
+                if any(
+                    filter_value in str(value).lower()
+                    for filter_value in self._normalized_values
+                )
             )
-        elif self.type in ALL_OPERATORS:
-            return all(
-                self._apply_filter_type(value, filter_value)
-                for filter_value in self.values
+        if self.type == FilterType.NOT_CONTAINS:
+            matching_values = set(
+                value
+                for value in values
+                if not any(
+                    filter_value in str(value).lower()
+                    for filter_value in self._normalized_values
+                )
             )
+            if len(matching_values) != len(values):
+                return set()
+            return matching_values
         raise ValueError(f"Unsupported filter type: {self.type}")
 
-    def apply_filter_on_values(self, values: List[ValueT]) -> bool:
-        if self.type in ANY_OPERATORS:
-            return any(self.apply_filter_on_value(value) for value in values)
-        elif self.type in ALL_OPERATORS:
-            return all(self.apply_filter_on_value(value) for value in values)
-        raise ValueError(f"Unsupported filter type: {self.type}")
+    def get_matching_values(self, values: Iterable[ValueT]) -> Set[str]:
+        values_set = FilterSchema.normalize_values(values)
+        return self.get_matching_normalized_values(values_set)
 
-    def get_matching_values(self, values: Iterable[ValueT]) -> Set[ValueT]:
-        values_list = set(values)
-        matching_values = set(
-            value for value in values_list if self.apply_filter_on_value(value)
-        )
-        if self.type in ANY_OPERATORS:
-            return matching_values
-        elif self.type in ALL_OPERATORS:
-            if len(matching_values) != len(values_list):
-                return set()
-            return matching_values
+    def apply_filter_on_values(self, values: List[ValueT]) -> bool:
+        if self.type in NEGATIVE_OPERATORS and not values:
+            return True
+        return bool(self.get_matching_values(values))
 
-        raise ValueError(f"Unsupported filter type: {self.type}")
+    def apply_filter_on_value(self, value: ValueT) -> bool:
+        return self.apply_filter_on_values([value])
 
 
 class StatusFilterSchema(FilterSchema[Status]):