diff --git a/src/main/java/baritone/behavior/PathingBehavior.java b/src/main/java/baritone/behavior/PathingBehavior.java
index 3e8c3595..1a4b12b9 100644
--- a/src/main/java/baritone/behavior/PathingBehavior.java
+++ b/src/main/java/baritone/behavior/PathingBehavior.java
@@ -409,7 +409,7 @@ public final class PathingBehavior extends Behavior implements IPathingBehavior,
             primaryTimeout = Baritone.settings().planAheadPrimaryTimeoutMS.get();
             failureTimeout = Baritone.settings().planAheadFailureTimeoutMS.get();
         }
-        CalculationContext context = new CalculationContext(baritone); // not safe to create on the other thread, it looks up a lot of stuff in minecraft
+        CalculationContext context = new CalculationContext(baritone, true); // not safe to create on the other thread, it looks up a lot of stuff in minecraft
         AbstractNodeCostSearch pathfinder = createPathfinder(start, goal, current == null ? null : current.getPath(), context, true);
         if (!Objects.equals(pathfinder.getGoal(), goal)) {
             logDebug("Simplifying " + goal.getClass() + " to GoalXZ due to distance");
diff --git a/src/main/java/baritone/pathing/movement/CalculationContext.java b/src/main/java/baritone/pathing/movement/CalculationContext.java
index cb4727cc..ace7670c 100644
--- a/src/main/java/baritone/pathing/movement/CalculationContext.java
+++ b/src/main/java/baritone/pathing/movement/CalculationContext.java
@@ -60,11 +60,15 @@ public class CalculationContext {
     private final BetterWorldBorder worldBorder;
 
     public CalculationContext(IBaritone baritone) {
+        this(baritone, false);
+    }
+
+    public CalculationContext(IBaritone baritone, boolean forUseOnAnotherThread) {
         this.baritone = baritone;
         this.player = baritone.getPlayerContext().player();
         this.world = baritone.getPlayerContext().world();
         this.worldData = (WorldData) baritone.getWorldProvider().getCurrentWorld();
-        this.bsi = new BlockStateInterface(world, worldData); // TODO TODO TODO
+        this.bsi = new BlockStateInterface(world, worldData, forUseOnAnotherThread); // TODO TODO TODO
         // new CalculationContext() needs to happen, can't add an argument (i'll beat you), can we get the world provider from currentlyTicking?
         this.toolSet = new ToolSet(player);
         this.hasThrowaway = Baritone.settings().allowPlace.get() && MovementHelper.throwaway(baritone.getPlayerContext(), false);
diff --git a/src/main/java/baritone/process/GetToBlockProcess.java b/src/main/java/baritone/process/GetToBlockProcess.java
index 95f2122b..920e5743 100644
--- a/src/main/java/baritone/process/GetToBlockProcess.java
+++ b/src/main/java/baritone/process/GetToBlockProcess.java
@@ -77,7 +77,7 @@ public class GetToBlockProcess extends BaritoneProcessHelper implements IGetToBl
         int mineGoalUpdateInterval = Baritone.settings().mineGoalUpdateInterval.get();
         if (mineGoalUpdateInterval != 0 && tickCount++ % mineGoalUpdateInterval == 0) { // big brain
             List<BlockPos> current = new ArrayList<>(knownLocations);
-            CalculationContext context = new CalculationContext(baritone);
+            CalculationContext context = new CalculationContext(baritone, true);
             Baritone.getExecutor().execute(() -> rescan(current, context));
         }
         Goal goal = new GoalComposite(knownLocations.stream().map(GoalGetToBlock::new).toArray(Goal[]::new));
diff --git a/src/main/java/baritone/process/MineProcess.java b/src/main/java/baritone/process/MineProcess.java
index 4ea75387..8b93d1cb 100644
--- a/src/main/java/baritone/process/MineProcess.java
+++ b/src/main/java/baritone/process/MineProcess.java
@@ -89,7 +89,7 @@ public final class MineProcess extends BaritoneProcessHelper implements IMinePro
         int mineGoalUpdateInterval = Baritone.settings().mineGoalUpdateInterval.get();
         if (mineGoalUpdateInterval != 0 && tickCount++ % mineGoalUpdateInterval == 0) { // big brain
             List<BlockPos> curr = new ArrayList<>(knownOreLocations);
-            CalculationContext context = new CalculationContext(baritone);
+            CalculationContext context = new CalculationContext(baritone, true);
             Baritone.getExecutor().execute(() -> rescan(curr, context));
         }
         if (Baritone.settings().legitMine.get()) {
diff --git a/src/main/java/baritone/utils/BlockStateInterface.java b/src/main/java/baritone/utils/BlockStateInterface.java
index 96493e00..be49c97c 100644
--- a/src/main/java/baritone/utils/BlockStateInterface.java
+++ b/src/main/java/baritone/utils/BlockStateInterface.java
@@ -49,12 +49,21 @@ public class BlockStateInterface {
     private static final IBlockState AIR = Blocks.AIR.getDefaultState();
 
     public BlockStateInterface(IPlayerContext ctx) {
-        this(ctx.world(), (WorldData) ctx.worldData());
+        this(ctx, false);
     }
 
-    public BlockStateInterface(World world, WorldData worldData) {
+    public BlockStateInterface(IPlayerContext ctx, boolean copyLoadedChunks) {
+        this(ctx.world(), (WorldData) ctx.worldData(), copyLoadedChunks);
+    }
+
+    public BlockStateInterface(World world, WorldData worldData, boolean copyLoadedChunks) {
         this.worldData = worldData;
-        this.loadedChunks = new Long2ObjectOpenHashMap<>(((IChunkProviderClient) world.getChunkProvider()).loadedChunks()); // make a copy that we can safely access from another thread
+        Long2ObjectMap<Chunk> worldLoaded = ((IChunkProviderClient) world.getChunkProvider()).loadedChunks();
+        if (copyLoadedChunks) {
+            this.loadedChunks = new Long2ObjectOpenHashMap<>(worldLoaded); // make a copy that we can safely access from another thread
+        } else {
+            this.loadedChunks = worldLoaded; // this will only be used on the main thread
+        }
         if (!Minecraft.getMinecraft().isCallingFromMinecraftThread()) {
             throw new IllegalStateException();
         }
diff --git a/src/main/java/baritone/utils/ExampleBaritoneControl.java b/src/main/java/baritone/utils/ExampleBaritoneControl.java
index 6b2c7448..2c112ee3 100644
--- a/src/main/java/baritone/utils/ExampleBaritoneControl.java
+++ b/src/main/java/baritone/utils/ExampleBaritoneControl.java
@@ -208,7 +208,7 @@ public class ExampleBaritoneControl extends Behavior implements Helper {
                 logDirect("No goal.");
             } else {
                 logDirect("Started segmented calculator");
-                SegmentedCalculator.calculateSegmentsThreaded(pathingBehavior.pathStart(), pathingBehavior.getGoal(), new CalculationContext(baritone), ipath -> {
+                SegmentedCalculator.calculateSegmentsThreaded(pathingBehavior.pathStart(), pathingBehavior.getGoal(), new CalculationContext(baritone, true), ipath -> {
                     logDirect("Found a path");
                     logDirect("Ends at " + ipath.getDest());
                     logDirect("Length " + ipath.length());