diff --git a/core/src/com/unciv/logic/city/CityInfo.kt b/core/src/com/unciv/logic/city/CityInfo.kt
index ce49d041fc..1f471f0e21 100644
--- a/core/src/com/unciv/logic/city/CityInfo.kt
+++ b/core/src/com/unciv/logic/city/CityInfo.kt
@@ -889,9 +889,10 @@ class CityInfo {
 
 
     fun getMatchingUniquesWithNonLocalEffects(uniqueType: UniqueType, stateForConditionals: StateForConditionals): Sequence<Unique> {
-        return cityConstructions.builtBuildingUniqueMap.getUniques(uniqueType)
-            .filter { !it.isLocalEffect && it.conditionalsApply(stateForConditionals) }
-        // Note that we don't query religion here, as those only have local effects
+        val uniques = cityConstructions.builtBuildingUniqueMap.getUniques(uniqueType)
+        // Memory performance showed that this function was very memory intensive, thus we only create the filter if needed
+        return if (uniques.any()) uniques.filter { !it.isLocalEffect && it.conditionalsApply(stateForConditionals) }
+        else uniques
     }
 
     //endregion