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diff --git a/org.argeo.api.uuid/src/org/argeo/api/uuid/libuuid/DirectLibuuidFactory.java b/org.argeo.api.uuid/src/org/argeo/api/uuid/libuuid/DirectLibuuidFactory.java
new file mode 100644
index 000000000..df3bb3174
--- /dev/null
+++ b/org.argeo.api.uuid/src/org/argeo/api/uuid/libuuid/DirectLibuuidFactory.java
@@ -0,0 +1,58 @@
+package org.argeo.api.uuid.libuuid;
+
+import java.nio.ByteBuffer;
+import java.util.UUID;
+
+import org.argeo.api.uuid.UuidBinaryUtils;
+import org.argeo.api.uuid.UuidFactory;
+
+/**
+ * @deprecated Rather use {@link LibuuidFactory}. This is just a proof of
+ *             concept that using shared memory in order to limit the JNI
+ *             overhead does not yield any significant performance gain. But it
+ *             could be an approach for computing and transferring bulk UUIDs
+ *             computations in one go, vi
+ *             {@link ByteBuffer#allocateDirect(int)}.
+ */
+public class DirectLibuuidFactory implements UuidFactory {
+	static {
+		System.loadLibrary("Java_org_argeo_api_uuid_libuuid");
+	}
+
+	@Override
+	public UUID get() {
+		return timeUUID();
+	}
+
+	@Override
+	public UUID timeUUID() {
+		ByteBuffer buf = ByteBuffer.allocateDirect(16);
+		timeUUID(buf);
+		byte[] arr = new byte[16];
+		buf.get(arr);
+		return UuidBinaryUtils.fromBytes(arr);
+	}
+
+	protected native void timeUUID(ByteBuffer uuidBuf);
+
+	@Override
+	public UUID nameUUIDv5(UUID namespace, byte[] data) {
+		throw new UnsupportedOperationException();
+	}
+
+	@Override
+	public UUID nameUUIDv3(UUID namespace, byte[] data) {
+		throw new UnsupportedOperationException();
+	}
+
+	@Override
+	public UUID randomUUIDStrong() {
+		throw new UnsupportedOperationException();
+	}
+
+	@Override
+	public UUID randomUUIDWeak() {
+		throw new UnsupportedOperationException();
+	}
+
+}