diff --git a/src/main/java/org/embeddedt/modernfix/common/mixin/perf/suspend_integrated_server_during_load/ClientPacketListenerMixin.java b/src/main/java/org/embeddedt/modernfix/common/mixin/perf/suspend_integrated_server_during_load/ClientPacketListenerMixin.java
new file mode 100644
index 00000000..2e2d6b53
--- /dev/null
+++ b/src/main/java/org/embeddedt/modernfix/common/mixin/perf/suspend_integrated_server_during_load/ClientPacketListenerMixin.java
@@ -0,0 +1,36 @@
+package org.embeddedt.modernfix.common.mixin.perf.suspend_integrated_server_during_load;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.multiplayer.ClientPacketListener;
+import net.minecraft.network.protocol.game.ClientboundCustomPayloadPacket;
+import org.embeddedt.modernfix.annotation.ClientOnlyMixin;
+import org.embeddedt.modernfix.duck.suspend_integrated_server_during_load.IDeferrableIntegratedServer;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(ClientPacketListener.class)
+@ClientOnlyMixin
+public class ClientPacketListenerMixin {
+    @Shadow
+    @Final
+    private Minecraft minecraft;
+
+    @Inject(method = "handleCustomPayload", at = @At("HEAD"), cancellable = true)
+    private void detectClientLoadSentinel(ClientboundCustomPayloadPacket packet, CallbackInfo ci) {
+        if (packet.getIdentifier().equals(IDeferrableIntegratedServer.CLIENT_LOAD_SENTINEL)) {
+            // Important: flag must be changed on the client thread, as later packets can start decoding
+            // while earlier ones are still being applied.
+            this.minecraft.executeIfPossible(() -> {
+                packet.getData().release();
+                if (this.minecraft.hasSingleplayerServer()) {
+                    ((IDeferrableIntegratedServer)this.minecraft.getSingleplayerServer()).mfix$markClientLoadFinished();
+                }
+            });
+            ci.cancel();
+        }
+    }
+}
diff --git a/src/main/java/org/embeddedt/modernfix/common/mixin/perf/suspend_integrated_server_during_load/IntegratedServerMixin.java b/src/main/java/org/embeddedt/modernfix/common/mixin/perf/suspend_integrated_server_during_load/IntegratedServerMixin.java
new file mode 100644
index 00000000..00791452
--- /dev/null
+++ b/src/main/java/org/embeddedt/modernfix/common/mixin/perf/suspend_integrated_server_during_load/IntegratedServerMixin.java
@@ -0,0 +1,33 @@
+package org.embeddedt.modernfix.common.mixin.perf.suspend_integrated_server_during_load;
+
+import com.llamalad7.mixinextras.injector.wrapoperation.Operation;
+import com.llamalad7.mixinextras.injector.wrapoperation.WrapOperation;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.server.IntegratedServer;
+import org.embeddedt.modernfix.annotation.ClientOnlyMixin;
+import org.embeddedt.modernfix.duck.suspend_integrated_server_during_load.IDeferrableIntegratedServer;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+
+import java.util.concurrent.atomic.AtomicBoolean;
+
+@Mixin(IntegratedServer.class)
+@ClientOnlyMixin
+public abstract class IntegratedServerMixin implements IDeferrableIntegratedServer {
+    private final AtomicBoolean mfix$hasPrimaryClientJoined = new AtomicBoolean(false);
+
+    /**
+     * @author embeddedt
+     * @reason Wait to be finished processing all expensive packets (recipes, tags, etc.)
+     * before continuing to tick the integrated server.
+     */
+    @WrapOperation(method = "tickServer", at = @At(value = "INVOKE", target = "Lnet/minecraft/client/Minecraft;isPaused()Z", ordinal = 0))
+    private boolean preventTicks(Minecraft instance, Operation<Boolean> original) {
+        return !mfix$hasPrimaryClientJoined.get() || original.call(instance);
+    }
+
+    @Override
+    public void mfix$markClientLoadFinished() {
+        mfix$hasPrimaryClientJoined.set(true);
+    }
+}
diff --git a/src/main/java/org/embeddedt/modernfix/common/mixin/perf/suspend_integrated_server_during_load/PlayerListMixin.java b/src/main/java/org/embeddedt/modernfix/common/mixin/perf/suspend_integrated_server_during_load/PlayerListMixin.java
new file mode 100644
index 00000000..ad802156
--- /dev/null
+++ b/src/main/java/org/embeddedt/modernfix/common/mixin/perf/suspend_integrated_server_during_load/PlayerListMixin.java
@@ -0,0 +1,26 @@
+package org.embeddedt.modernfix.common.mixin.perf.suspend_integrated_server_during_load;
+
+import io.netty.buffer.Unpooled;
+import net.minecraft.network.Connection;
+import net.minecraft.network.FriendlyByteBuf;
+import net.minecraft.network.protocol.game.ClientboundCustomPayloadPacket;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.server.players.PlayerList;
+import org.embeddedt.modernfix.annotation.ClientOnlyMixin;
+import org.embeddedt.modernfix.duck.suspend_integrated_server_during_load.IDeferrableIntegratedServer;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(PlayerList.class)
+@ClientOnlyMixin
+public class PlayerListMixin {
+    @Inject(method = "placeNewPlayer", at = @At("RETURN"))
+    private void sendConfigFinishedSentinelPacket(Connection connection, ServerPlayer player, CallbackInfo ci) {
+        if (connection.isMemoryConnection()) {
+            FriendlyByteBuf friendlybytebuf = new FriendlyByteBuf(Unpooled.buffer());
+            player.connection.send(new ClientboundCustomPayloadPacket(IDeferrableIntegratedServer.CLIENT_LOAD_SENTINEL, friendlybytebuf));
+        }
+    }
+}
diff --git a/src/main/java/org/embeddedt/modernfix/duck/suspend_integrated_server_during_load/IDeferrableIntegratedServer.java b/src/main/java/org/embeddedt/modernfix/duck/suspend_integrated_server_during_load/IDeferrableIntegratedServer.java
new file mode 100644
index 00000000..452fe0fa
--- /dev/null
+++ b/src/main/java/org/embeddedt/modernfix/duck/suspend_integrated_server_during_load/IDeferrableIntegratedServer.java
@@ -0,0 +1,10 @@
+package org.embeddedt.modernfix.duck.suspend_integrated_server_during_load;
+
+import net.minecraft.resources.ResourceLocation;
+import org.embeddedt.modernfix.ModernFix;
+
+public interface IDeferrableIntegratedServer {
+    ResourceLocation CLIENT_LOAD_SENTINEL = new ResourceLocation(ModernFix.MODID, "mark_client_load_finished");
+
+    void mfix$markClientLoadFinished();
+}