From a53287b2581039fde0984b15d87a04b5982f6038 Mon Sep 17 00:00:00 2001
From: Jakfut <jakfut0@gmail.com>
Date: Tue, 27 Oct 2026 21:14:08 +0000
Subject: [PATCH 1/2] Send only the written bytes of each network packet

---
 src/main/java/detrav/net/DetravNetwork.java  | 3 ++-
 src/main/java/gregtech/common/GTNetwork.java | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/main/java/detrav/net/DetravNetwork.java b/src/main/java/detrav/net/DetravNetwork.java
index 30bdb23157e..be3a440456c 100644
--- a/src/main/java/detrav/net/DetravNetwork.java
+++ b/src/main/java/detrav/net/DetravNetwork.java
@@ -38,9 +38,10 @@ protected void encode(ChannelHandlerContext ctx, DetravPacket msg, List<Object>
         ByteBuf buf = Unpooled.buffer();
         buf.writeByte(msg.getPacketID());
         msg.encode(new ByteBufOutputStream(buf));
+        // FMLProxyPacket sends the whole backing array of its buffer, so give it one holding only the written bytes
         out.add(
             new FMLProxyPacket(
-                buf,
+                buf.copy(),
                 ctx.channel()
                     .attr(NetworkRegistry.FML_CHANNEL)
                     .get()));
diff --git a/src/main/java/gregtech/common/GTNetwork.java b/src/main/java/gregtech/common/GTNetwork.java
index f118f7120e0..892f498669f 100644
--- a/src/main/java/gregtech/common/GTNetwork.java
+++ b/src/main/java/gregtech/common/GTNetwork.java
@@ -55,9 +55,10 @@ protected void encode(ChannelHandlerContext aContext, GTPacket aPacket, List<Obj
         final ByteBuf tBuf = Unpooled.buffer()
             .writeByte(aPacket.getPacketID());
         aPacket.encode(tBuf);
+        // FMLProxyPacket sends the whole backing array of its buffer, so give it one holding only the written bytes
         aOutput.add(
             new FMLProxyPacket(
-                tBuf,
+                tBuf.copy(),
                 aContext.channel()
                     .attr(NetworkRegistry.FML_CHANNEL)
                     .get()));

From ab13f76679554e1b9202e7cd8a63b69296d551e2 Mon Sep 17 00:00:00 2001
From: Jakfut <jakfut0@gmail.com>
Date: Tue, 27 Oct 2026 21:29:46 +0000
Subject: [PATCH 2/2] Send only the written bytes of the large molecular
 assembler's crafting effect item

---
 src/main/java/gregtech/api/net/GTPacketLMACraftingFX.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/main/java/gregtech/api/net/GTPacketLMACraftingFX.java b/src/main/java/gregtech/api/net/GTPacketLMACraftingFX.java
index 35537e75066..5f2a7eeaa9c 100644
--- a/src/main/java/gregtech/api/net/GTPacketLMACraftingFX.java
+++ b/src/main/java/gregtech/api/net/GTPacketLMACraftingFX.java
@@ -51,7 +51,9 @@ public void encode(ByteBuf buffer) {
         try {
             ByteBuf stackBuffer = Unpooled.buffer();
             itemStack.writeToPacket(stackBuffer);
-            byte[] data = stackBuffer.array();
+            // only the written bytes: the backing array also holds the buffer's unused capacity
+            byte[] data = new byte[stackBuffer.readableBytes()];
+            stackBuffer.readBytes(data);
             buffer.writeInt(data.length);
             buffer.writeBytes(data);
         } catch (IOException e) {