From 447f921cf1afbbddce7ed4cf68861223064a0f99 Mon Sep 17 00:00:00 2001
From: Bloepiloepi <59421074+Bloepiloepi@users.noreply.github.com>
Date: Mon, 9 Aug 2021 16:37:46 +0200
Subject: [PATCH 1/2] Send only changed attributes

---
 .../minestom/server/entity/LivingEntity.java   | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/src/main/java/net/minestom/server/entity/LivingEntity.java b/src/main/java/net/minestom/server/entity/LivingEntity.java
index 28657961c..34964bcd2 100644
--- a/src/main/java/net/minestom/server/entity/LivingEntity.java
+++ b/src/main/java/net/minestom/server/entity/LivingEntity.java
@@ -507,10 +507,11 @@ public class LivingEntity extends Entity implements EquipmentHandler {
                 // connection null during Player initialization (due to #super call)
                 self = playerConnection != null && playerConnection.getConnectionState() == ConnectionState.PLAY;
             }
+            EntityPropertiesPacket propertiesPacket = getPropertiesPacket(Collections.singleton(attributeInstance));
             if (self) {
-                sendPacketToViewersAndSelf(getPropertiesPacket());
+                sendPacketToViewersAndSelf(propertiesPacket);
             } else {
-                sendPacketToViewers(getPropertiesPacket());
+                sendPacketToViewers(propertiesPacket);
             }
         }
     }
@@ -632,8 +633,19 @@ public class LivingEntity extends Entity implements EquipmentHandler {
      */
     @NotNull
     protected EntityPropertiesPacket getPropertiesPacket() {
+        return getPropertiesPacket(attributeModifiers.values());
+    }
+
+    /**
+     * Gets an {@link EntityPropertiesPacket} for this entity with the specified attribute values.
+     *
+     * @param attributes the attributes to include in the packet
+     * @return an {@link EntityPropertiesPacket} linked to this entity
+     */
+    @NotNull
+    protected EntityPropertiesPacket getPropertiesPacket(@NotNull Collection<AttributeInstance> attributes) {
         // Get all the attributes which should be sent to the client
-        final AttributeInstance[] instances = attributeModifiers.values().stream()
+        final AttributeInstance[] instances = attributes.stream()
                 .filter(i -> i.getAttribute().isShared())
                 .toArray(AttributeInstance[]::new);
 

From aaad91ff47cf40e5095c8a67a920675d919163f2 Mon Sep 17 00:00:00 2001
From: Bloepiloepi <59421074+Bloepiloepi@users.noreply.github.com>
Date: Mon, 9 Aug 2021 16:41:01 +0200
Subject: [PATCH 2/2] Initialize every projectile in CrossbowMeta

---
 .../java/net/minestom/server/item/metadata/CrossbowMeta.java  | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/main/java/net/minestom/server/item/metadata/CrossbowMeta.java b/src/main/java/net/minestom/server/item/metadata/CrossbowMeta.java
index 5aa7d45f3..ec322db3a 100644
--- a/src/main/java/net/minestom/server/item/metadata/CrossbowMeta.java
+++ b/src/main/java/net/minestom/server/item/metadata/CrossbowMeta.java
@@ -81,7 +81,9 @@ public class CrossbowMeta extends ItemMeta implements ItemMetaBuilder.Provider<S
     public static class Builder extends ItemMetaBuilder {
 
         private boolean triple;
-        private ItemStack projectile1, projectile2, projectile3 = ItemStack.AIR;
+        private ItemStack projectile1 = ItemStack.AIR;
+        private ItemStack projectile2 = ItemStack.AIR;
+        private ItemStack projectile3 = ItemStack.AIR;
         private boolean charged;
 
         /**