Thread count should depend on the processor count

src/main/java/net/minestom/server/UpdateManager.java

@@ -8,7 +8,6 @@ import net.minestom.server.lock.Acquisition;
 import net.minestom.server.monitoring.TickMonitor;
 import net.minestom.server.network.ConnectionManager;
 import net.minestom.server.network.player.NettyPlayerConnection;
-import net.minestom.server.thread.PerChunkThreadProvider;
 import net.minestom.server.thread.PerInstanceThreadProvider;
 import net.minestom.server.thread.ThreadProvider;
 import net.minestom.server.utils.async.AsyncUtils;
@@ -40,8 +39,8 @@ public final class UpdateManager {
 
     {
         // DEFAULT THREAD PROVIDER
-        threadProvider = new PerInstanceThreadProvider(4);
+        threadProvider = new PerInstanceThreadProvider();
-        //threadProvider = new PerChunkThreadProvider(4);
+        //threadProvider = new PerChunkThreadProvider();
     }
 
     /**

src/main/java/net/minestom/server/thread/PerChunkThreadProvider.java

@@ -12,6 +12,10 @@ public class PerChunkThreadProvider extends ThreadProvider {
         super(threadCount);
     }
 
+    public PerChunkThreadProvider() {
+        super();
+    }
+
     @Override
     public long findThread(@NotNull Chunk chunk) {
         return chunk.hashCode();

src/main/java/net/minestom/server/thread/PerInstanceThreadProvider.java

@@ -13,6 +13,10 @@ public class PerInstanceThreadProvider extends ThreadProvider {
         super(threadCount);
     }
 
+    public PerInstanceThreadProvider() {
+        super();
+    }
+
     @Override
     public long findThread(@NotNull Chunk chunk) {
         return chunk.getInstance().hashCode();

src/main/java/net/minestom/server/thread/ThreadProvider.java

@@ -51,6 +51,10 @@ public abstract class ThreadProvider {
         }
     }
 
+    public ThreadProvider() {
+        this(Runtime.getRuntime().availableProcessors());
+    }
+
     public synchronized void onInstanceCreate(@NotNull Instance instance) {
         instance.getChunks().forEach(this::addChunk);
     }