diff --git a/dependencies.gradle b/dependencies.gradle
index 041826c0..94bcffaa 100644
--- a/dependencies.gradle
+++ b/dependencies.gradle
@@ -1,12 +1,12 @@
 // Add your dependencies here
 
 dependencies {
-    api('com.github.GTNewHorizons:ForestryMC:4.11.0:dev')
-    implementation('com.github.GTNewHorizons:GTNHLib:0.7.3:dev')
+    api('com.github.GTNewHorizons:ForestryMC:4.11.4:dev')
+    implementation('com.github.GTNewHorizons:GTNHLib:0.9.13:dev')
 
-    devOnlyNonPublishable('com.github.GTNewHorizons:NotEnoughItems:2.8.26-GTNH:dev')
+    devOnlyNonPublishable('com.github.GTNewHorizons:NotEnoughItems:2.8.63-GTNH:dev')
 
-    compileOnly('com.github.GTNewHorizons:BuildCraft:7.1.45:api')
+    compileOnly('com.github.GTNewHorizons:BuildCraft:7.1.55:api')
     compileOnly('net.industrial-craft:industrialcraft-2:2.2.828-experimental:dev')
     compileOnly("curse.maven:extrabiomesxl-60041:2273301")
 }
diff --git a/gradle.properties b/gradle.properties
index 21bd5cd7..2a8709c4 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -39,14 +39,34 @@ remoteMappings = https\://raw.githubusercontent.com/MinecraftForge/FML/1.7.10/co
 # `./gradlew runClient --username=AnotherPlayer`, or configuring this command in your IDE.
 developmentEnvironmentUserName = Developer
 
-# Enables using modern Java syntax (up to version 17) via Jabel, while still targeting JVM 8.
-# See https://github.com/bsideup/jabel for details on how this works.
-enableModernJavaSyntax = true
+# Enables modern Java syntax support. Valid values:
+# - false: No modern syntax, Java 8 only
+# - jabel: Jabel syntax-only support, compiles to J8 bytecode
+# - jvmDowngrader: Full modern Java via JVM Downgrader (syntax + stdlib APIs)
+# - modern: Native modern Java bytecode, no downgrading
+enableModernJavaSyntax = jabel
 
 # If set, ignores the above setting and compiles with the given toolchain. This may cause unexpected issues,
 # and should *not* be used in most situations. -1 disables this.
 # forceToolchainVersion = -1
 
+# Target JVM version for JVM Downgrader bytecode downgrading.
+# Only used when enableModernJavaSyntax = jvmDowngrader
+# downgradeTargetVersion = 8
+
+# Comma-separated list of Java versions for multi-release jar support (JVM Downgrader only).
+# Classes will be available in META-INF/versions/N/ for each version N in this list.
+# Default: "21,25" (J25+ gets native classes, J21-24 gets partial downgrade, J8-20 gets full downgrade).
+# jvmDowngraderMultiReleaseVersions = 21,25
+
+# Specifies how JVM Downgrader API stubs are provided. Options:
+# - shade: Shade minimized stubs into the jar
+# - gtnhlib: GTNHLib provides stubs at runtime (adds version constraint)
+# - external: Another dependency provides stubs (no constraint, no warning)
+# - (empty): Warning reminding you to configure stubs
+# Note: 'shade' option requires you to verify license compliance, see: https://github.com/unimined/JvmDowngrader/blob/main/LICENSE.md
+# jvmDowngraderStubsProvider =
+
 # Enables injecting missing generics into the decompiled source code for a better coding experience.
 # Turns most publicly visible List, Map, etc. into proper List<E>, Map<K, V> types.
 enableGenericInjection = true
diff --git a/settings.gradle b/settings.gradle
index 2b172cf9..335f37c4 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -17,5 +17,5 @@ pluginManagement {
 }
 
 plugins {
-    id 'com.gtnewhorizons.gtnhsettingsconvention' version '2.0.6'
+    id 'com.gtnewhorizons.gtnhsettingsconvention' version '2.0.19'
 }
diff --git a/src/main/java/binnie/core/machines/inventory/ComponentInventorySlots.java b/src/main/java/binnie/core/machines/inventory/ComponentInventorySlots.java
index 6df30578..700a30a6 100644
--- a/src/main/java/binnie/core/machines/inventory/ComponentInventorySlots.java
+++ b/src/main/java/binnie/core/machines/inventory/ComponentInventorySlots.java
@@ -1,7 +1,6 @@
 package binnie.core.machines.inventory;
 
 import java.util.ArrayList;
-import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Random;
@@ -16,10 +15,13 @@
 import net.minecraftforge.common.util.ForgeDirection;
 
 import binnie.core.machines.IMachine;
+import it.unimi.dsi.fastutil.ints.Int2ObjectLinkedOpenHashMap;
 
 public class ComponentInventorySlots extends ComponentInventory implements IInventoryMachine, IInventorySlots {
 
-    private final Map<Integer, InventorySlot> inventory = new LinkedHashMap<>();
+    private final Int2ObjectLinkedOpenHashMap<InventorySlot> inventory = new Int2ObjectLinkedOpenHashMap<>();
+    private int cachedSize = 0;
+    private int[] cachedAccessibleSlots = null;
 
     public ComponentInventorySlots(IMachine machine) {
         super(machine);
@@ -27,25 +29,20 @@ public ComponentInventorySlots(IMachine machine) {
 
     @Override
     public int getSizeInventory() {
-        int size = 0;
-        for (Integer index : inventory.keySet()) {
-            size = Math.max(size, index + 1);
-        }
-        return size;
+        return cachedSize;
     }
 
     @Override
     public ItemStack getStackInSlot(int index) {
-        if (inventory.containsKey(index)) {
-            return inventory.get(index).getContent();
-        }
-        return null;
+        InventorySlot slot = inventory.get(index);
+        return slot != null ? slot.getContent() : null;
     }
 
     @Override
     public ItemStack decrStackSize(int index, int amount) {
-        if (inventory.containsKey(index)) {
-            ItemStack stack = inventory.get(index).decrStackSize(amount);
+        InventorySlot slot = inventory.get(index);
+        if (slot != null) {
+            ItemStack stack = slot.decrStackSize(amount);
             markDirty();
             return stack;
         }
@@ -59,8 +56,9 @@ public ItemStack getStackInSlotOnClosing(int var1) {
 
     @Override
     public void setInventorySlotContents(int index, ItemStack itemStack) {
-        if (inventory.containsKey(index) && (itemStack == null || inventory.get(index).isValid(itemStack))) {
-            inventory.get(index).setContent(itemStack);
+        InventorySlot slot = inventory.get(index);
+        if (slot != null && (itemStack == null || slot.isValid(itemStack))) {
+            slot.setContent(itemStack);
         }
         markDirty();
     }
@@ -113,7 +111,7 @@ public void readFromNBT(NBTTagCompound nbttagcompound) {
     public void writeToNBT(NBTTagCompound nbttagcompound) {
         super.writeToNBT(nbttagcompound);
         NBTTagList inventoryNBT = new NBTTagList();
-        for (Map.Entry<Integer, InventorySlot> entry : inventory.entrySet()) {
+        for (Map.Entry<Integer, InventorySlot> entry : inventory.int2ObjectEntrySet()) {
             NBTTagCompound slotNBT = new NBTTagCompound();
             slotNBT.setInteger("id", entry.getKey());
             entry.getValue().writeToNBT(slotNBT);
@@ -125,6 +123,8 @@ public void writeToNBT(NBTTagCompound nbttagcompound) {
     @Override
     public InventorySlot addSlot(int index, String unlocalizedName) {
         inventory.put(index, new InventorySlot(index, unlocalizedName));
+        cachedSize = Math.max(cachedSize, index + 1);
+        cachedAccessibleSlots = null;
         return getSlot(index);
     }
 
@@ -138,10 +138,7 @@ public InventorySlot[] addSlotArray(int[] indexes, String unlocalizedName) {
 
     @Override
     public InventorySlot getSlot(int index) {
-        if (inventory.containsKey(index)) {
-            return inventory.get(index);
-        }
-        return null;
+        return inventory.get(index);
     }
 
     @Override
@@ -151,7 +148,7 @@ public InventorySlot[] getAllSlots() {
 
     @Override
     public InventorySlot[] getSlots(int[] indexes) {
-        List<InventorySlot> list = new ArrayList<>();
+        List<InventorySlot> list = new ArrayList<>(indexes.length);
         for (int i : indexes) {
             if (getSlot(i) != null) {
                 list.add(getSlot(i));
@@ -213,18 +210,20 @@ public void onDestruction() {
 
     @Override
     public int[] getAccessibleSlotsFromSide(int var1) {
-        List<Integer> slots = new ArrayList<>();
-        for (InventorySlot slot : inventory.values()) {
-            if (slot.canInsert() || slot.canExtract()) {
-                slots.add(slot.getIndex());
+        if (cachedAccessibleSlots == null) {
+            List<Integer> slots = new ArrayList<>();
+            for (InventorySlot slot : inventory.values()) {
+                if (slot.canInsert() || slot.canExtract()) {
+                    slots.add(slot.getIndex());
+                }
             }
-        }
 
-        int[] ids = new int[slots.size()];
-        for (int i = 0; i < slots.size(); ++i) {
-            ids[i] = slots.get(i);
+            cachedAccessibleSlots = new int[slots.size()];
+            for (int i = 0; i < slots.size(); ++i) {
+                cachedAccessibleSlots[i] = slots.get(i);
+            }
         }
-        return ids;
+        return cachedAccessibleSlots;
     }
 
     @Override
@@ -234,6 +233,7 @@ public boolean canInsertItem(int slot, ItemStack itemstack, int direction) {
 
     @Override
     public boolean canExtractItem(int slot, ItemStack itemstack, int direction) {
-        return getSlot(slot).canExtract(ForgeDirection.getOrientation(direction));
+        InventorySlot iSlot = getSlot(slot);
+        return iSlot != null && iSlot.canExtract(ForgeDirection.getOrientation(direction));
     }
 }