Don't perform spatial queries for location->location checks until needed.

src/main/java/com/sk89q/worldguard/bukkit/listener/RegionProtectionListener.java

@@ -31,6 +31,7 @@
 import com.sk89q.worldguard.bukkit.event.entity.DestroyEntityEvent;
 import com.sk89q.worldguard.bukkit.event.entity.SpawnEntityEvent;
 import com.sk89q.worldguard.bukkit.event.entity.UseEntityEvent;
+import com.sk89q.worldguard.bukkit.util.DelayedRegionOverlapAssociation;
 import com.sk89q.worldguard.bukkit.util.Entities;
 import com.sk89q.worldguard.bukkit.util.Materials;
 import com.sk89q.worldguard.domains.Association;
@@ -114,12 +115,10 @@ private RegionAssociable createRegionAssociable(Cause cause) {
             return getPlugin().wrapPlayer((Player) rootCause);
         } else if (rootCause instanceof Entity) {
             RegionQuery query = getPlugin().getRegionContainer().createQuery();
-            ApplicableRegionSet source = query.getApplicableRegions(((Entity) rootCause).getLocation());
-            return new RegionOverlapAssociation(source.getRegions());
+            return new DelayedRegionOverlapAssociation(query, ((Entity) rootCause).getLocation());
         } else if (rootCause instanceof Block) {
             RegionQuery query = getPlugin().getRegionContainer().createQuery();
-            ApplicableRegionSet source = query.getApplicableRegions(((Block) rootCause).getLocation());
-            return new RegionOverlapAssociation(source.getRegions());
+            return new DelayedRegionOverlapAssociation(query, ((Block) rootCause).getLocation());
         } else {
             return Associables.constant(Association.NON_MEMBER);
         }

src/main/java/com/sk89q/worldguard/bukkit/util/DelayedRegionOverlapAssociation.java

@@ -0,0 +1,75 @@
+/*
+ * WorldGuard, a suite of tools for Minecraft
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldGuard team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldguard.bukkit.util;
+
+import com.sk89q.worldguard.bukkit.RegionQuery;
+import com.sk89q.worldguard.domains.Association;
+import com.sk89q.worldguard.protection.ApplicableRegionSet;
+import com.sk89q.worldguard.protection.association.RegionAssociable;
+import com.sk89q.worldguard.protection.regions.ProtectedRegion;
+import org.bukkit.Location;
+
+import javax.annotation.Nullable;
+import java.util.Set;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Determines that the association to a region is {@code OWNER} if the input
+ * region is in a set of source regions.
+ *
+ * <p>This class only performs a spatial query if its
+ * {@link #getAssociation(ProtectedRegion)} method is called.</p>
+ */
+public class DelayedRegionOverlapAssociation implements RegionAssociable {
+
+    private final RegionQuery query;
+    private final Location location;
+    @Nullable
+    private Set<ProtectedRegion> source;
+
+    /**
+     * Create a new instance.
+     *
+     * @param query the query
+     * @param location the location
+     */
+    public DelayedRegionOverlapAssociation(RegionQuery query, Location location) {
+        checkNotNull(query);
+        checkNotNull(location);
+        this.query = query;
+        this.location = location;
+    }
+
+    @Override
+    public Association getAssociation(ProtectedRegion region) {
+        if (source == null) {
+            ApplicableRegionSet result = query.getApplicableRegions(location);
+            source = result.getRegions();
+        }
+
+        if (source.contains(region)) {
+            return Association.OWNER;
+        } else {
+            return Association.NON_MEMBER;
+        }
+    }
+
+}