diff --git a/src/main/java/draylar/horizon/MinersHorizon.java b/src/main/java/draylar/horizon/MinersHorizon.java
index c5364f9..1086a68 100644
--- a/src/main/java/draylar/horizon/MinersHorizon.java
+++ b/src/main/java/draylar/horizon/MinersHorizon.java
@@ -1,12 +1,12 @@
 package draylar.horizon;
 
 import draylar.horizon.config.MinersHorizonConfig;
-import draylar.horizon.registry.HorizonBiomes;
 import draylar.horizon.registry.HorizonBlocks;
 import draylar.horizon.registry.HorizonWorld;
 import draylar.horizon.util.HorizonPortalHelper;
 import draylar.omegaconfig.OmegaConfig;
 import net.fabricmc.api.ModInitializer;
+import net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents;
 import net.fabricmc.fabric.api.event.player.UseBlockCallback;
 import net.fabricmc.fabric.api.object.builder.v1.world.poi.PointOfInterestHelper;
 import net.minecraft.item.ItemStack;
@@ -31,9 +31,6 @@ public void onInitialize() {
         // Register ores from config
         HorizonWorld.registerOreHandlers();
 
-        // Load biomes after ores are loaded
-        HorizonBiomes.init();
-
         // The following callback is used for portal activation via any Pickaxe.
         UseBlockCallback.EVENT.register((player, world, hand, blockHitResult) -> {
             if(!world.isClient) {
@@ -48,6 +45,8 @@ public void onInitialize() {
 
             return ActionResult.PASS;
         });
+
+        ServerLifecycleEvents.SERVER_STARTING.register(ms -> HorizonWorld.ensureBlocksAreRegistered());
     }
 
     public static Identifier id(String path) {
diff --git a/src/main/java/draylar/horizon/MinersHorizonClient.java b/src/main/java/draylar/horizon/MinersHorizonClient.java
index a6af40d..c4af530 100644
--- a/src/main/java/draylar/horizon/MinersHorizonClient.java
+++ b/src/main/java/draylar/horizon/MinersHorizonClient.java
@@ -4,6 +4,7 @@
 import draylar.horizon.registry.HorizonWorld;
 import net.fabricmc.api.ClientModInitializer;
 import net.fabricmc.fabric.api.blockrenderlayer.v1.BlockRenderLayerMap;
+import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents;
 import net.fabricmc.fabric.api.client.rendering.v1.ColorProviderRegistry;
 import net.minecraft.block.Block;
 import net.minecraft.block.Material;
@@ -19,6 +20,8 @@ public class MinersHorizonClient implements ClientModInitializer {
 
     @Override
     public void onInitializeClient() {
+        ClientLifecycleEvents.CLIENT_STARTED.register(mc -> HorizonWorld.ensureBlocksAreRegistered());
+
         BlockRenderLayerMap.INSTANCE.putBlock(HorizonBlocks.HORIZON_PORTAL, RenderLayer.getTranslucent());
 
         // Register a color provider for stone/ore blocks.
diff --git a/src/main/java/draylar/horizon/registry/HorizonBiomes.java b/src/main/java/draylar/horizon/registry/HorizonBiomes.java
index 4ea5f4f..7f3cfae 100644
--- a/src/main/java/draylar/horizon/registry/HorizonBiomes.java
+++ b/src/main/java/draylar/horizon/registry/HorizonBiomes.java
@@ -17,7 +17,6 @@
 
 public class HorizonBiomes {
 
-    private static final Biome ROCKY_PLAINS = createRockyPlains();
     public static final RegistryKey<Biome> ROCKY_PLAINS_KEYS = RegistryKey.of(Registry.BIOME_KEY, MinersHorizon.id("rocky_plains"));
 
     private HorizonBiomes() {
@@ -25,7 +24,7 @@ private HorizonBiomes() {
     }
 
     public static void init() {
-        Registry.register(BuiltinRegistries.BIOME, ROCKY_PLAINS_KEYS.getValue(), ROCKY_PLAINS);
+        Registry.register(BuiltinRegistries.BIOME, ROCKY_PLAINS_KEYS.getValue(), createRockyPlains());
     }
 
     public static Biome createRockyPlains() {
diff --git a/src/main/java/draylar/horizon/registry/HorizonWorld.java b/src/main/java/draylar/horizon/registry/HorizonWorld.java
index e724bda..c2be7c8 100644
--- a/src/main/java/draylar/horizon/registry/HorizonWorld.java
+++ b/src/main/java/draylar/horizon/registry/HorizonWorld.java
@@ -26,9 +26,7 @@
 import net.minecraft.world.gen.surfacebuilder.SurfaceConfig;
 import net.minecraft.world.gen.surfacebuilder.TernarySurfaceConfig;
 
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.List;
+import java.util.*;
 
 public class HorizonWorld {
 
@@ -79,32 +77,41 @@ public static void init() {
         Registry.register(Registry.CHUNK_GENERATOR, MinersHorizon.id("horizon"), MinersHorizonChunkGenerator.CODEC);
     }
 
+    private static final Map<String, List<OreConfig>> REMAINING_BLOCKS = new TreeMap<>();
+
     public static void registerOreHandlers() {
         List<OreConfig> ores = new ArrayList<>(Arrays.asList(MinersHorizon.CONFIG.oreConfigList));
 
+        for (OreConfig ore : ores) {
+            REMAINING_BLOCKS.computeIfAbsent(ore.block, s -> new ArrayList<>()).add(ore);
+        }
+
         // Handle ores that have already been registered.
         Registry.BLOCK.getEntries().forEach(entry -> {
-            RegistryKey<Block> key = entry.getKey();
-            String id = key.getValue().toString();
-
-            // Load every Ore Config with a matching ID.
-            ores.stream().filter(config -> config.block.equals(id)).forEach(config -> {
-                ORES.add(load(config, entry.getValue()));
-            });
+            processRegisteredBlock(entry.getKey().getValue().toString(), entry.getValue());
         });
 
-        // TODO: there is a chance this slows down game loading. The question is how much?
-        // 100 entries * 1,000 registry events = 100,000 filter checks.
         // Register a callback to add in future ores.
         RegistryEntryAddedCallback.event(Registry.BLOCK).register((rawId, id, object) -> {
-
-            // Load every Ore Config with a matching ID.
-            ores.stream().filter(config -> config.block.equals(id.toString())).forEach(config -> {
-                ORES.add(load(config, object));
-            });
+            processRegisteredBlock(id.toString(), object);
         });
     }
 
+    private static void processRegisteredBlock(String id, Block block) {
+        List<OreConfig> configs = REMAINING_BLOCKS.remove(id);
+
+        if (configs != null) {
+            for (OreConfig config : configs) {
+                ORES.add(load(config, block));
+            }
+
+            if (REMAINING_BLOCKS.size() == 0) {
+                // Register the biome if all ores have been loaded.
+                HorizonBiomes.init();
+            }
+        }
+    }
+
     private static ConfiguredFeature<?, ?> load(OreConfig config, Block block) {
         return register(
                 String.format("%s_%d_%d_%d", new Identifier(config.block).getPath(), config.size, config.count, config.maxY),
@@ -117,4 +124,14 @@ public static void registerOreHandlers() {
                         .spreadHorizontally()
                         .repeat(config.count));
     }
+
+    public static void ensureBlocksAreRegistered() {
+        if (REMAINING_BLOCKS.size() > 0) {
+            String errorMessage = String.format(
+                    "Miners Horizon: Could not register biome because the following blocks do not exist, yet they were specified in the config:%n%s.",
+                    String.join(", ", REMAINING_BLOCKS.keySet().toArray(String[]::new))
+            );
+            throw new RuntimeException(errorMessage);
+        }
+    }
 }