diff --git a/prj/coherence-core/src/main/java/com/tangosol/util/filter/InFilter.java b/prj/coherence-core/src/main/java/com/tangosol/util/filter/InFilter.java
index 6236ec3aa9ff8..2be91f512a5fd 100644
--- a/prj/coherence-core/src/main/java/com/tangosol/util/filter/InFilter.java
+++ b/prj/coherence-core/src/main/java/com/tangosol/util/filter/InFilter.java
@@ -106,8 +106,33 @@ public String toStringValue()
     public int calculateEffectiveness(Map mapIndexes, Set setKeys)
         {
         MapIndex index = (MapIndex) mapIndexes.get(getValueExtractor());
-        return index == null ? calculateIteratorEffectiveness(setKeys.size())
-                             : ((Collection) getValue()).size();
+        if (index == null)
+            {
+            // there is no relevant index
+            return -1;
+            }
+        else
+            {
+            // calculating the exact number of keys retained is too expensive;
+            // ignore the fact that there may be duplicates and simply return
+            // the worst possible number of keys retained, as if they were unique
+
+            Collection colValues   = getValue();
+            Map        mapContents = index.getIndexContents();
+            int        cMatch      = 0;
+
+            for (Object oValue : colValues)
+                {
+                Set setEQ = (Set) mapContents.get(oValue);
+
+                if (setEQ != null)
+                    {
+                    cMatch += setEQ.size();
+                    }
+                }
+
+            return Math.min(cMatch, setKeys.size());
+            }
         }
 
     /**
diff --git a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/AllFilterTest.java b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/AllFilterTest.java
index 1dfaa45f33c6b..732fc59a732eb 100644
--- a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/AllFilterTest.java
+++ b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/AllFilterTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2023, Oracle and/or its affiliates.
+ * Copyright (c) 2000, 2024, Oracle and/or its affiliates.
  *
  * Licensed under the Universal Permissive License v 1.0 as shown at
  * https://oss.oracle.com/licenses/upl.
@@ -41,7 +41,7 @@ public AllFilterTest(boolean fOrdered, boolean fPartial)
         m_fPartial = fPartial;
         }
 
-    @Parameterized.Parameters
+    @Parameterized.Parameters(name ="ordered={0} partial={1}")
     public static Collection data() {
        Object[][] data = new Object[][]
             { new Object[] {Boolean.FALSE, Boolean.FALSE},
@@ -86,6 +86,8 @@ public void testApplyIndex()
             }
 
         // begin test
+        assertEquals(3, filter.calculateEffectiveness(mapIndexes, setKeys));
+
         filter.applyIndex(mapIndexes, setKeys);
 
         assertEquals("Two keys should remain in the set of keys.",
diff --git a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/AndFilterTest.java b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/AndFilterTest.java
index 7990a46c109d4..822330c6fe326 100644
--- a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/AndFilterTest.java
+++ b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/AndFilterTest.java
@@ -1,8 +1,8 @@
 /*
- * Copyright (c) 2000, 2022, Oracle and/or its affiliates.
+ * Copyright (c) 2000, 2024, Oracle and/or its affiliates.
  *
  * Licensed under the Universal Permissive License v 1.0 as shown at
- * http://oss.oracle.com/licenses/upl.
+ * https://oss.oracle.com/licenses/upl.
  */
 package com.tangosol.util.filter;
 
@@ -39,7 +39,7 @@ public AndFilterTest(boolean fOrdered, boolean fPartial)
         m_fPartial = fPartial;
         }
 
-    @Parameterized.Parameters
+    @Parameterized.Parameters(name ="ordered={0} partial={1}")
     public static Collection data() {
        Object[][] data = new Object[][]
             { new Object[] {Boolean.FALSE, Boolean.FALSE},
@@ -93,6 +93,8 @@ public void testApplyIndex()
         when(index.getIndexContents()).thenReturn(mapInverse);
 
         // begin test
+        assertEquals(3, filter.calculateEffectiveness(mapIndexes, setKeys));
+
         filter.applyIndex(mapIndexes, setKeys);
 
         assertEquals("Two keys should remain in the set of keys.",
diff --git a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/AnyFilterTest.java b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/AnyFilterTest.java
index 62c06704b7a20..ad2f737301ead 100644
--- a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/AnyFilterTest.java
+++ b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/AnyFilterTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2023, Oracle and/or its affiliates.
+ * Copyright (c) 2000, 2024, Oracle and/or its affiliates.
  *
  * Licensed under the Universal Permissive License v 1.0 as shown at
  * https://oss.oracle.com/licenses/upl.
@@ -39,7 +39,7 @@ public AnyFilterTest(boolean fOrdered, boolean fPartial)
         m_fPartial = fPartial;
         }
 
-    @Parameterized.Parameters
+    @Parameterized.Parameters(name ="ordered={0} partial={1}")
     public static Collection data() {
        Object[][] data = new Object[][]
             { new Object[] {Boolean.FALSE, Boolean.FALSE},
@@ -93,6 +93,8 @@ public void testApplyIndex()
         when(index.getIndexContents()).thenReturn(mapInverse);
 
         // begin test
+        assertEquals(2, filter.calculateEffectiveness(mapIndexes, setKeys));
+
         filter.applyIndex(mapIndexes, setKeys);
 
         assertEquals("Two keys should remain in the set of keys.",
diff --git a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/ContainsAllFilterTest.java b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/ContainsAllFilterTest.java
index 3153883c5e40a..028a91137199c 100644
--- a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/ContainsAllFilterTest.java
+++ b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/ContainsAllFilterTest.java
@@ -1,8 +1,8 @@
 /*
- * Copyright (c) 2000, 2022, Oracle and/or its affiliates.
+ * Copyright (c) 2000, 2024, Oracle and/or its affiliates.
  *
  * Licensed under the Universal Permissive License v 1.0 as shown at
- * http://oss.oracle.com/licenses/upl.
+ * https://oss.oracle.com/licenses/upl.
  */
 
 package com.tangosol.util.filter;
@@ -39,7 +39,7 @@ public ContainsAllFilterTest(boolean fOrdered, boolean fPartial)
         m_fPartial = fPartial;
         }
 
-    @Parameterized.Parameters
+    @Parameterized.Parameters(name ="ordered={0} partial={1}")
     public static Collection data() {
        Object[][] data = new Object[][]
             { new Object[] {Boolean.FALSE, Boolean.FALSE},
@@ -94,6 +94,8 @@ public void testApplyIndex()
         when(index.getIndexContents()).thenReturn(mapInverse);
 
         // begin test
+        assertEquals(2, filter.calculateEffectiveness(mapIndexes, setKeys));
+
         filter.applyIndex(mapIndexes, setKeys);
 
         assertEquals(2, setKeys.size());
diff --git a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/ContainsAnyFilterTest.java b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/ContainsAnyFilterTest.java
index 701ca6448817c..67c0b11f8feae 100644
--- a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/ContainsAnyFilterTest.java
+++ b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/ContainsAnyFilterTest.java
@@ -1,8 +1,8 @@
 /*
- * Copyright (c) 2000, 2022, Oracle and/or its affiliates.
+ * Copyright (c) 2000, 2024, Oracle and/or its affiliates.
  *
  * Licensed under the Universal Permissive License v 1.0 as shown at
- * http://oss.oracle.com/licenses/upl.
+ * https://oss.oracle.com/licenses/upl.
  */
 
 package com.tangosol.util.filter;
@@ -39,7 +39,7 @@ public ContainsAnyFilterTest(boolean fOrdered, boolean fPartial)
         m_fPartial = fPartial;
         }
 
-    @Parameterized.Parameters
+    @Parameterized.Parameters(name ="ordered={0} partial={1}")
     public static Collection data() {
        Object[][] data = new Object[][]
             { new Object[] {Boolean.FALSE, Boolean.FALSE},
@@ -94,6 +94,8 @@ public void testApplyIndex()
         when(index.getIndexContents()).thenReturn(mapInverse);
 
         // begin test
+        assertEquals(6, filter.calculateEffectiveness(mapIndexes, setKeys));
+
         filter.applyIndex(mapIndexes, setKeys);
 
         assertEquals(4, setKeys.size());
diff --git a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/ContainsFilterTest.java b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/ContainsFilterTest.java
index d36764f4261f3..87a039bc5ebf9 100644
--- a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/ContainsFilterTest.java
+++ b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/ContainsFilterTest.java
@@ -1,8 +1,8 @@
 /*
- * Copyright (c) 2000, 2022, Oracle and/or its affiliates.
+ * Copyright (c) 2000, 2024, Oracle and/or its affiliates.
  *
  * Licensed under the Universal Permissive License v 1.0 as shown at
- * http://oss.oracle.com/licenses/upl.
+ * https://oss.oracle.com/licenses/upl.
  */
 
 package com.tangosol.util.filter;
@@ -39,7 +39,7 @@ public ContainsFilterTest(boolean fOrdered, boolean fPartial)
         m_fPartial = fPartial;
         }
 
-    @Parameterized.Parameters
+    @Parameterized.Parameters(name ="ordered={0} partial={1}")
     public static Collection data() {
        Object[][] data = new Object[][]
             { new Object[] {Boolean.FALSE, Boolean.FALSE},
@@ -94,6 +94,8 @@ public void testApplyIndex()
         when(index.getIndexContents()).thenReturn(mapInverse);
 
         // begin test
+        assertEquals(3, filter.calculateEffectiveness(mapIndexes, setKeys));
+
         filter.applyIndex(mapIndexes, setKeys);
 
         assertEquals(3, setKeys.size());
diff --git a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/EqualsFilterTest.java b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/EqualsFilterTest.java
index 185697b67c5d0..06affad0a22ff 100644
--- a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/EqualsFilterTest.java
+++ b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/EqualsFilterTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2023, Oracle and/or its affiliates.
+ * Copyright (c) 2000, 2024, Oracle and/or its affiliates.
  *
  * Licensed under the Universal Permissive License v 1.0 as shown at
  * https://oss.oracle.com/licenses/upl.
@@ -47,7 +47,7 @@ public EqualsFilterTest(boolean fOrdered, boolean fPartial)
         m_fPartial = fPartial;
         }
 
-    @Parameterized.Parameters
+    @Parameterized.Parameters(name ="ordered={0} partial={1}")
     public static Collection data() {
        Object[][] data = new Object[][]
             { new Object[] {Boolean.FALSE, Boolean.FALSE},
@@ -99,6 +99,8 @@ public void testApplyIndex()
         when(index.getIndexContents()).thenReturn(mapInverse);
 
         // begin test
+        assertEquals(1, filter.calculateEffectiveness(mapIndexes, setKeys));
+
         filter.applyIndex(mapIndexes, setKeys);
 
         assertEquals("One key should remain in the set of keys.",
diff --git a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/InFilterTest.java b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/InFilterTest.java
index 3d9d60dafba95..8054597ebad70 100644
--- a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/InFilterTest.java
+++ b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/InFilterTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2023, Oracle and/or its affiliates.
+ * Copyright (c) 2000, 2024, Oracle and/or its affiliates.
  *
  * Licensed under the Universal Permissive License v 1.0 as shown at
  * https://oss.oracle.com/licenses/upl.
@@ -43,7 +43,7 @@ public InFilterTest(boolean fOrdered, boolean fPartial)
         m_fPartial = fPartial;
         }
 
-    @Parameterized.Parameters
+    @Parameterized.Parameters(name ="ordered={0} partial={1}")
     public static Collection data() {
        Object[][] data = new Object[][]
             { new Object[] {Boolean.FALSE, Boolean.FALSE},
@@ -93,6 +93,8 @@ public void testApplyIndex()
 
         // begin test
         Set<String> setKeys = new HashSet<>(map.keySet());
+        assertEquals(4, filter.calculateEffectiveness(mapIndexes, setKeys));
+
         filter.applyIndex(mapIndexes, setKeys);
 
         assertEquals(4, setKeys.size());
diff --git a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/KeyFilterTest.java b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/KeyFilterTest.java
index 8e7c59fb10f45..bf466c657689d 100644
--- a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/KeyFilterTest.java
+++ b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/KeyFilterTest.java
@@ -1,8 +1,8 @@
 /*
- * Copyright (c) 2000, 2022, Oracle and/or its affiliates.
+ * Copyright (c) 2000, 2024, Oracle and/or its affiliates.
  *
  * Licensed under the Universal Permissive License v 1.0 as shown at
- * http://oss.oracle.com/licenses/upl.
+ * https://oss.oracle.com/licenses/upl.
  */
 package com.tangosol.util.filter;
 
@@ -38,7 +38,7 @@ public KeyFilterTest(boolean fOrdered, boolean fPartial)
         m_fPartial = fPartial;
         }
 
-    @Parameterized.Parameters
+    @Parameterized.Parameters(name ="ordered={0} partial={1}")
     public static Collection data() {
        Object[][] data = new Object[][]
             { new Object[] {Boolean.FALSE, Boolean.FALSE},
@@ -90,6 +90,8 @@ public void testApplyIndex()
         when(index.getIndexContents()).thenReturn(mapInverse);
 
         // begin test
+        assertEquals(2, filter.calculateEffectiveness(mapIndexes, setKeys));
+
         filter.applyIndex(mapIndexes, setKeys);
 
         assertEquals("Two keys should remain in the set of keys.",
diff --git a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/LikeFilterTest.java b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/LikeFilterTest.java
index de9d8fe6064e5..07051dc08566a 100644
--- a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/LikeFilterTest.java
+++ b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/LikeFilterTest.java
@@ -1,8 +1,8 @@
 /*
- * Copyright (c) 2000, 2022, Oracle and/or its affiliates.
+ * Copyright (c) 2000, 2024, Oracle and/or its affiliates.
  *
  * Licensed under the Universal Permissive License v 1.0 as shown at
- * http://oss.oracle.com/licenses/upl.
+ * https://oss.oracle.com/licenses/upl.
  */
 package com.tangosol.util.filter;
 
@@ -39,7 +39,7 @@ public LikeFilterTest(boolean fOrdered, boolean fPartial)
         m_fPartial = fPartial;
         }
 
-    @Parameterized.Parameters
+    @Parameterized.Parameters(name ="ordered={0} partial={1}")
     public static Collection data() {
        Object[][] data = new Object[][]
             { new Object[] {Boolean.FALSE, Boolean.FALSE},
@@ -106,6 +106,8 @@ public void testApplyIndex()
         when(index.getIndexContents()).thenReturn(mapInverse);
 
         // begin test
+        assertEquals(2, filter.calculateEffectiveness(mapIndexes, setKeys));
+
         filter.applyIndex(mapIndexes, setKeys);
 
         assertEquals("Two keys should remain in the set of keys.",
diff --git a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/NotEqualsFilterTest.java b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/NotEqualsFilterTest.java
index 976b2192ef04d..18ea626f8bf1a 100644
--- a/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/NotEqualsFilterTest.java
+++ b/prj/test/unit/coherence-tests/src/test/java/com/tangosol/util/filter/NotEqualsFilterTest.java
@@ -1,8 +1,8 @@
 /*
- * Copyright (c) 2000, 2022, Oracle and/or its affiliates.
+ * Copyright (c) 2000, 2024, Oracle and/or its affiliates.
  *
  * Licensed under the Universal Permissive License v 1.0 as shown at
- * http://oss.oracle.com/licenses/upl.
+ * https://oss.oracle.com/licenses/upl.
  */
 package com.tangosol.util.filter;
 
@@ -38,7 +38,7 @@ public NotEqualsFilterTest(boolean fOrdered, boolean fPartial)
         m_fPartial = fPartial;
         }
 
-    @Parameterized.Parameters
+    @Parameterized.Parameters(name ="ordered={0} partial={1}")
     public static Collection data() {
        Object[][] data = new Object[][]
             { new Object[] {Boolean.FALSE, Boolean.FALSE},
@@ -89,6 +89,8 @@ public void testApplyIndex()
         when(index.getIndexContents()).thenReturn(mapInverse);
 
         // begin test
+        assertEquals(3 + (m_fPartial ? 4 : 0), filter.calculateEffectiveness(mapIndexes, setKeys));
+
         filter.applyIndex(mapIndexes, setKeys);
 
         assertEquals("One key should have been removed from the set of keys.",