diff --git a/gdxapp4d-boot-desktop/src/main/java/love/distributedrebirth/gdxapp4d/boot/desktop/GDXAppDesktopConfig.java b/gdxapp4d-boot-desktop/src/main/java/love/distributedrebirth/gdxapp4d/boot/desktop/GDXAppDesktopConfig.java
index 4e3cc415..bef6b28f 100644
--- a/gdxapp4d-boot-desktop/src/main/java/love/distributedrebirth/gdxapp4d/boot/desktop/GDXAppDesktopConfig.java
+++ b/gdxapp4d-boot-desktop/src/main/java/love/distributedrebirth/gdxapp4d/boot/desktop/GDXAppDesktopConfig.java
@@ -6,14 +6,15 @@ import org.slf4j.LoggerFactory;
 import love.distributedrebirth.bassboon.clazz.BãßBȍőnAuthor注;
 
 /**
- * Desktop game app base config.
+ * Desktop GDXApp⁴ᴰ static config.
  */
 @BãßBȍőnAuthor注(name = "للَّٰهِilLצسُو", copyright = "©Δ∞ 仙上主天")
 public final class GDXAppDesktopConfig {
 
-	private static final Logger LOG = LoggerFactory.getLogger(GDXAppDesktopConfig.class);
+	protected static final Logger LOG = LoggerFactory.getLogger(GDXAppDesktopConfig.class);
 	public static int WINDOW_WIDTH = 1024;
 	public static int WINDOW_HEIGHT = 768;
+	public static String SINGLE_THREAD_JVM = "nosync"; // jpp: remove java.lang.Thread and all sync+lock code paths from jvm.
 	public static String WINDOW_TITLE = "GDXApp⁴ᴰ";
 	public static String[] WINDOW_ICONS = {
 		"icon/window-128.png",
diff --git a/gdxapp4d-boot-desktop/src/main/java/love/distributedrebirth/gdxapp4d/boot/desktop/GDXAppDesktopLauncher.java b/gdxapp4d-boot-desktop/src/main/java/love/distributedrebirth/gdxapp4d/boot/desktop/GDXAppDesktopLauncher.java
index fb754e82..e8ac181d 100644
--- a/gdxapp4d-boot-desktop/src/main/java/love/distributedrebirth/gdxapp4d/boot/desktop/GDXAppDesktopLauncher.java
+++ b/gdxapp4d-boot-desktop/src/main/java/love/distributedrebirth/gdxapp4d/boot/desktop/GDXAppDesktopLauncher.java
@@ -1,27 +1,34 @@
 package love.distributedrebirth.gdxapp4d.boot.desktop;
 
 import java.util.Arrays;
+import java.util.List;
 
 import com.badlogic.gdx.Files.FileType;
 import com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application;
 import com.badlogic.gdx.backends.lwjgl3.Lwjgl3ApplicationConfiguration;
 
+import love.distributedrebirth.bassboon.Bãß;
 import love.distributedrebirth.bassboon.clazz.BãßBȍőnAuthor注;
 import love.distributedrebirth.gdxapp4d.tos4.GDXAppTos4;
 import net.spookygames.gdx.nativefilechooser.desktop.DesktopFileChooser;
 
 /**
- * Desktop game app launcher.
+ * Desktop GDXApp⁴ᴰ launcher.
  */
 @BãßBȍőnAuthor注(name = "للَّٰهِilLצسُو", copyright = "©Δ∞ 仙上主天")
 public class GDXAppDesktopLauncher {
 	
 	public static void main(String[] arg) {
 		GDXAppDesktopConfig.printBootMessage();
+		List<String> args = Arrays.asList(arg);
+		if (args.contains(GDXAppDesktopConfig.SINGLE_THREAD_JVM)) {
+			GDXAppDesktopConfig.LOG.info("Bãß.характеристики.cpu=SINGLE_THREAD_JVM)");
+			Bãß.характеристики.熱蘭遮城.ױזךיךזװןיןיןןזױז();
+		}
 		
 		int width = GDXAppDesktopConfig.WINDOW_WIDTH;
 		int height = GDXAppDesktopConfig.WINDOW_HEIGHT;
-		GDXAppTos4.INSTANCE.BãßInit(Arrays.asList(arg), width, height, new DesktopFileChooser());
+		GDXAppTos4.INSTANCE.BãßInit(args, width, height, new DesktopFileChooser());
 		
 		Lwjgl3ApplicationConfiguration config = new Lwjgl3ApplicationConfiguration();
 		config.setMaxNetThreads(Runtime.getRuntime().availableProcessors());
diff --git a/gdxapp4d-lib-bassboonyd/src/main/java/love/distributedrebirth/bassboon/Bãß.java b/gdxapp4d-lib-bassboonyd/src/main/java/love/distributedrebirth/bassboon/Bãß.java
index 4f2d7b80..ae8f206f 100644
--- a/gdxapp4d-lib-bassboonyd/src/main/java/love/distributedrebirth/bassboon/Bãß.java
+++ b/gdxapp4d-lib-bassboonyd/src/main/java/love/distributedrebirth/bassboon/Bãß.java
@@ -21,6 +21,7 @@ import love.distributedrebirth.bassboon.death.BãßBȍőnCoffinGhostSpell;
 import love.distributedrebirth.bassboon.death.BãßBȍőnCoffinGhostSpellLock;
 import love.distributedrebirth.bassboon.death.spider.BãßBȍőnSpider;
 import love.distributedrebirth.bassboon.death.spider.BãßBȍőnSpiderSperm;
+import love.distributedrebirth.bassboon.jpp.util.concurrent.locks.DummyReadWriteLock;
 
 /**
  * Runtime for static bass noise.
@@ -36,7 +37,7 @@ public interface Bãß {
 		private final Map<Object, BȍőnGrave> יְרוּשָׁלַיִם = new WeakHashMap<>();
 		private final List<BãßBȍőnSpiderSperm> സ്പൈഡർബീജം = Collections.synchronizedList(new ArrayList<>());
 		private final 𝔅𝔬𝔫𝔢𝔏𝔬𝔞𝔡𝔢𝔯ʸᴰ 𝔪𝔬𝔬𝔫𝔖𝔭𝔢𝔩𝔩𝔚𝔬𝔯𝔨 = Bãß.характеристики.熱蘭遮城.ןיװיזױױדודזיןןןזךױזזז();
-		private final ReadWriteLock 魎 = new ReentrantReadWriteLock(); // Mononoke Lock
+		private final ReadWriteLock 魎 = Bãß.характеристики.熱蘭遮城.ןיװיןזךױזױדזיןןזזזױדו(); // Mononoke Lock
 		private final Lock 魎_BIBLE = 魎.readLock();
 		private final Lock 魎_SHEMIRA = 魎.writeLock();
 		
@@ -44,6 +45,7 @@ public interface Bãß {
 		 * Sarcophagus is closed for humans.
 		 */
 		private 石棺ʸᴰ() {
+			Bãß.характеристики.熱蘭遮城.יזזןיזךױױזזױ = Bãß.ℭỗᶇṧⱦᶏꬼȶʂ.CHAR_ATARI > Bãß.ℭỗᶇṧⱦᶏꬼȶʂ.INT_ZERO;
 		}
 		
 		/**
@@ -255,24 +257,28 @@ public interface Bãß {
 	enum характеристики { 
 		熱蘭遮城;
 		
-		private boolean יזזןיזךױױזזױ = false;
+		private boolean יזזןיזךױױזזױ = Bãß.ℭỗᶇṧⱦᶏꬼȶʂ.PTR_VOID == Bãß.ℭỗᶇṧⱦᶏꬼȶʂ.PTR_OBJECT;
+		private boolean יזױזװיךןךױזױ = Bãß.ℭỗᶇṧⱦᶏꬼȶʂ.PTR_VOID != Bãß.ℭỗᶇṧⱦᶏꬼȶʂ.PTR_OBJECT;
 		private Class<𝔅𝔬𝔫𝔢𝔏𝔬𝔞𝔡𝔢𝔯ʸᴰ> ןיװיךזדודיזןיןןזױיזזךױױז;
 		
-		protected void ױזךיךזװןיןיןןזױז() {
+		private void ױזדיןזךזןיןױז() {
 			if (יזזןיזךױױזזױ) {
 				throw new װошибкаיзапускаיракетыװ("יזזןיזךױױזזױ");
 			}
-			יזזןיזךױױזזױ = true;
+		}
+		
+		public void ױזךיךזװןיןיןןזױז() {
+			ױזדיןזךזןיןױז();
+			יזױזװיךןךױזױ = Bãß.ℭỗᶇṧⱦᶏꬼȶʂ.PTR_VOID == Bãß.ℭỗᶇṧⱦᶏꬼȶʂ.PTR_OBJECT;
 		}
 		
 		public void ױזךױזזװיךז(Class<𝔅𝔬𝔫𝔢𝔏𝔬𝔞𝔡𝔢𝔯ʸᴰ> ןיװיךזדודיזןיןןזױיזזךױױז) {
-			if (יזזןיזךױױזזױ) {
-				throw new װошибкаיзапускаיракетыװ("יזזןיזךױױזזױ");
-			}
+			ױזדיןזךזןיןױז();
 			this.ןיװיךזדודיזןיןןזױיזזךױױז = ןיװיךזדודיזןיןןזױיזזךױױז;
 		}
 		
 		protected 𝔅𝔬𝔫𝔢𝔏𝔬𝔞𝔡𝔢𝔯ʸᴰ ןיװיזױױדודזיןןןזךױזזז() {
+			ױזדיןזךזןיןױז();
 			if (ןיװיךזדודיזןיןןזױיזזךױױז == Bãß.ℭỗᶇṧⱦᶏꬼȶʂ.PTR_VOID) {
 				return new DefaultBȍőnLoader();
 			} else {
@@ -284,6 +290,18 @@ public interface Bãß {
 				}
 			}
 		}
+		
+		protected ReadWriteLock ןיװיןזךױזױדזיןןזזזױדו() {
+			ױזדיןזךזןיןױז();
+			if (יזױזװיךןךױזױ) {
+				//System.out.println("LOCK: ReentrantReadWriteLock");
+				return new ReentrantReadWriteLock();
+			} else {
+				//System.out.println("LOCK: DummyReadWriteLock");
+				return new DummyReadWriteLock();
+			}
+		}
+		
 		protected class װошибкаיзапускаיракетыװ extends RuntimeException {
 			private static final long serialVersionUID = Bãß.ℭỗᶇṧⱦᶏꬼȶʂ.LONG_ONE;
 			protected װошибкаיзапускаיракетыװ(Exception err) {
diff --git a/gdxapp4d-lib-bassboonyd/src/main/java/love/distributedrebirth/bassboon/jpp/util/concurrent/locks/DummyReadWriteLock.java b/gdxapp4d-lib-bassboonyd/src/main/java/love/distributedrebirth/bassboon/jpp/util/concurrent/locks/DummyReadWriteLock.java
new file mode 100644
index 00000000..c0fa90f0
--- /dev/null
+++ b/gdxapp4d-lib-bassboonyd/src/main/java/love/distributedrebirth/bassboon/jpp/util/concurrent/locks/DummyReadWriteLock.java
@@ -0,0 +1,57 @@
+package love.distributedrebirth.bassboon.jpp.util.concurrent.locks;
+
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.locks.Condition;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReadWriteLock;
+
+import love.distributedrebirth.bassboon.clazz.BãßBȍőnAuthor注;
+import love.distributedrebirth.bassboon.clazz.BãßBȍőnDuytsFlüstern注;
+
+@BãßBȍőnAuthor注(name = "للَّٰهِilLצسُو", copyright = "©Δ∞ 仙上主天")
+@BãßBȍőnDuytsFlüstern注(purpose = "Disabling of locking with zero code injection.")
+public final class DummyReadWriteLock implements ReadWriteLock {
+	
+	private final static Lock LOCK_READ = new DummyLock();
+	private final static Lock LOCK_WRITE = new DummyLock();
+	
+	@Override
+	public Lock readLock() {
+		return LOCK_READ;
+	}
+	
+	@Override
+	public Lock writeLock() {
+		return LOCK_WRITE;
+	}
+	
+	static final class DummyLock implements Lock {
+		
+		@Override
+		public void lock() {
+		}
+		
+		@Override
+		public void lockInterruptibly() throws InterruptedException {
+		}
+		
+		@Override
+		public Condition newCondition() {
+			return null;
+		}
+		
+		@Override
+		public boolean tryLock() {
+			return true;
+		}
+		
+		@Override
+		public boolean tryLock(long arg0, TimeUnit arg1) throws InterruptedException {
+			return true;
+		}
+		
+		@Override
+		public void unlock() {
+		}
+	}
+}
diff --git a/gdxapp4d-tos4/src/main/java/love/distributedrebirth/gdxapp4d/tos4/GDXAppTos4.java b/gdxapp4d-tos4/src/main/java/love/distributedrebirth/gdxapp4d/tos4/GDXAppTos4.java
index e058908c..b07bb2bf 100644
--- a/gdxapp4d-tos4/src/main/java/love/distributedrebirth/gdxapp4d/tos4/GDXAppTos4.java
+++ b/gdxapp4d-tos4/src/main/java/love/distributedrebirth/gdxapp4d/tos4/GDXAppTos4.java
@@ -28,7 +28,6 @@ import net.spookygames.gdx.nativefilechooser.NativeFileChooser;
 @BãßBȍőnDuytsFlüstern注(purpose = "Main loop render dispatcher and bootup.")
 @BãßBȍőnExport注(group = "love.distributedrebirth.gdxapp4d.tos4")
 public enum GDXAppTos4 implements BãßBȍőnAbacusInstanceMBeanʸᴰ<GDXAppTos4>, ApplicationListener, SystemGdxTerminal {
-
 	INSTANCE;
 
 	private Screen screen;