diff --git a/worldedit-core/src/main/java/com/sk89q/worldedit/EditSession.java b/worldedit-core/src/main/java/com/sk89q/worldedit/EditSession.java
index bc459da25..d71e2e42e 100644
--- a/worldedit-core/src/main/java/com/sk89q/worldedit/EditSession.java
+++ b/worldedit-core/src/main/java/com/sk89q/worldedit/EditSession.java
@@ -3321,7 +3321,7 @@ public class EditSession extends AbstractDelegateExtent implements HasFaweQueue,
     }
 
     private void recurseHollow(Region region, BlockVector3 origin, Set<BlockVector3> outside) {
-        final BlockVectorSet queue = new BlockVectorSet();
+        final LocalBlockVectorSet queue = new LocalBlockVectorSet();
         while (!queue.isEmpty()) {
             Iterator<BlockVector3> iter = queue.iterator();
             while (iter.hasNext()) {
diff --git a/worldedit-core/src/main/java/com/sk89q/worldedit/regions/AbstractRegion.java b/worldedit-core/src/main/java/com/sk89q/worldedit/regions/AbstractRegion.java
index 66b3028e5..af136464e 100644
--- a/worldedit-core/src/main/java/com/sk89q/worldedit/regions/AbstractRegion.java
+++ b/worldedit-core/src/main/java/com/sk89q/worldedit/regions/AbstractRegion.java
@@ -19,6 +19,7 @@
 
 package com.sk89q.worldedit.regions;
 
+import com.boydti.fawe.object.collection.BlockVectorSet;
 import com.sk89q.worldedit.math.BlockVector2;
 import com.sk89q.worldedit.math.BlockVector3;
 import com.sk89q.worldedit.math.Vector3;
@@ -181,7 +182,7 @@ public abstract class AbstractRegion implements Region {
 
     @Override
     public Set<BlockVector3> getChunkCubes() {
-        final Set<BlockVector3> chunks = new HashSet<>();
+        final Set<BlockVector3> chunks = new BlockVectorSet();
 
         final BlockVector3 min = getMinimumPoint();
         final BlockVector3 max = getMaximumPoint();
diff --git a/worldedit-core/src/main/java/com/sk89q/worldedit/regions/CuboidRegion.java b/worldedit-core/src/main/java/com/sk89q/worldedit/regions/CuboidRegion.java
index 17b4c87a0..5d6da1301 100644
--- a/worldedit-core/src/main/java/com/sk89q/worldedit/regions/CuboidRegion.java
+++ b/worldedit-core/src/main/java/com/sk89q/worldedit/regions/CuboidRegion.java
@@ -24,6 +24,8 @@ import com.boydti.fawe.config.Settings;
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
 
+import com.boydti.fawe.object.collection.BlockVectorSet;
+import com.boydti.fawe.object.collection.LocalBlockVectorSet;
 import com.sk89q.worldedit.math.BlockVector2;
 import com.sk89q.worldedit.math.BlockVector3;
 import com.sk89q.worldedit.math.MutableBlockVector3;
@@ -371,7 +373,7 @@ public class CuboidRegion extends AbstractRegion implements FlatRegion {
     }
     @Override
     public Set<BlockVector3> getChunkCubes() {
-        Set<BlockVector3> chunks = new HashSet<>();
+        Set<BlockVector3> chunks = new BlockVectorSet();
 
         BlockVector3 min = getMinimumPoint();
         BlockVector3 max = getMaximumPoint();
diff --git a/worldedit-core/src/main/java/com/sk89q/worldedit/world/snapshot/SnapshotRestore.java b/worldedit-core/src/main/java/com/sk89q/worldedit/world/snapshot/SnapshotRestore.java
index c5b134c62..28404f30e 100644
--- a/worldedit-core/src/main/java/com/sk89q/worldedit/world/snapshot/SnapshotRestore.java
+++ b/worldedit-core/src/main/java/com/sk89q/worldedit/world/snapshot/SnapshotRestore.java
@@ -19,6 +19,7 @@
 
 package com.sk89q.worldedit.world.snapshot;
 
+import com.boydti.fawe.object.collection.LocalBlockVectorSet;
 import com.sk89q.worldedit.EditSession;
 import com.sk89q.worldedit.MaxChangedBlocksException;
 import com.sk89q.worldedit.math.BlockVector2;
@@ -35,13 +36,14 @@ import java.util.ArrayList;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 
 /**
  * A snapshot restore operation.
  */
 public class SnapshotRestore {
 
-    private final Map<BlockVector2, ArrayList<BlockVector3>> neededChunks = new LinkedHashMap<>();
+    private final Map<BlockVector2, Set<BlockVector3>> neededChunks = new LinkedHashMap<>();
     private final ChunkStore chunkStore;
     private final EditSession editSession;
     private ArrayList<BlockVector2> missingChunks;
@@ -108,7 +110,7 @@ public class SnapshotRestore {
 
         // Unidentified chunk
         if (!neededChunks.containsKey(chunkPos)) {
-            neededChunks.put(chunkPos, new ArrayList<>());
+            neededChunks.put(chunkPos, new LocalBlockVectorSet());
         }
 
         neededChunks.get(chunkPos).add(pos);
@@ -134,7 +136,7 @@ public class SnapshotRestore {
         errorChunks = new ArrayList<>();
 
         // Now let's start restoring!
-        for (Map.Entry<BlockVector2, ArrayList<BlockVector3>> entry : neededChunks.entrySet()) {
+        for (Map.Entry<BlockVector2, Set<BlockVector3>> entry : neededChunks.entrySet()) {
             BlockVector2 chunkPos = entry.getKey();
             Chunk chunk;