diff --git a/client_version b/client_version
index 582626e..bd5ab57 100644
--- a/client_version
+++ b/client_version
@@ -1 +1 @@
-u24
\ No newline at end of file
+u25
\ No newline at end of file
diff --git a/patches/minecraft/net/minecraft/client/gui/GuiOptions.edit.java b/patches/minecraft/net/minecraft/client/gui/GuiOptions.edit.java
index 41c88f9..b818f0a 100644
--- a/patches/minecraft/net/minecraft/client/gui/GuiOptions.edit.java
+++ b/patches/minecraft/net/minecraft/client/gui/GuiOptions.edit.java
@@ -59,7 +59,11 @@
 ~ 				I18n.format("options.debugConsoleButton", new Object[0])));
 ~ 		btn.enabled = EagRuntime.getPlatformType() != EnumPlatformType.DESKTOP;
 
-> CHANGE  24 : 25  @  24 : 25
+> INSERT  17 : 18  @  17
+
++ 			SingleplayerServerController.setDifficulty(-1);
+
+> CHANGE  7 : 8  @  7 : 8
 
 ~ 	protected void actionPerformed(GuiButton parGuiButton) {
 
diff --git a/patches/minecraft/net/minecraft/network/play/server/S41PacketServerDifficulty.edit.java b/patches/minecraft/net/minecraft/network/play/server/S41PacketServerDifficulty.edit.java
index 6d88f89..2647d52 100644
--- a/patches/minecraft/net/minecraft/network/play/server/S41PacketServerDifficulty.edit.java
+++ b/patches/minecraft/net/minecraft/network/play/server/S41PacketServerDifficulty.edit.java
@@ -9,4 +9,14 @@
 
 + 
 
+> CHANGE  22 : 25  @  22 : 23
+
+~ 		int i = parPacketBuffer.readUnsignedByte();
+~ 		this.difficulty = EnumDifficulty.getDifficultyEnum(i & 3);
+~ 		this.difficultyLocked = (i & 4) != 0;
+
+> CHANGE  3 : 4  @  3 : 4
+
+~ 		parPacketBuffer.writeByte(this.difficulty.getDifficultyId() | (this.difficultyLocked ? 4 : 0));
+
 > EOF
diff --git a/patches/minecraft/net/minecraft/server/MinecraftServer.edit.java b/patches/minecraft/net/minecraft/server/MinecraftServer.edit.java
index fae012e..1070e89 100644
--- a/patches/minecraft/net/minecraft/server/MinecraftServer.edit.java
+++ b/patches/minecraft/net/minecraft/server/MinecraftServer.edit.java
@@ -30,7 +30,9 @@
 
 > DELETE  8  @  8 : 11
 
-> DELETE  1  @  1 : 3
+> CHANGE  1 : 2  @  1 : 3
+
+~ import net.minecraft.network.play.server.S41PacketServerDifficulty;
 
 > DELETE  1  @  1 : 2
 
@@ -118,8 +120,13 @@
 
 > DELETE  1  @  1 : 2
 
-> CHANGE  39 : 44  @  39 : 40
+> DELETE  32  @  32 : 35
 
+> CHANGE  3 : 11  @  3 : 5
+
+~ 		if (this.worldServers[0].getWorldInfo().getDifficulty() == null) {
+~ 			this.setDifficultyForAllWorlds(this.getDifficulty());
+~ 		}
 ~ 		this.isSpawnChunksLoaded = this.worldServers[0].getWorldInfo().getGameRulesInstance()
 ~ 				.getBoolean("loadSpawnChunks");
 ~ 		if (this.isSpawnChunksLoaded) {
@@ -248,7 +255,24 @@
 
 > DELETE  4  @  4 : 8
 
-> DELETE  35  @  35 : 55
+> INSERT  16 : 19  @  16
+
++ 		this.getConfigurationManager().sendPacketToAllPlayers(new S41PacketServerDifficulty(
++ 				this.worldServers[0].getDifficulty(), this.worldServers[0].getWorldInfo().isDifficultyLocked()));
++ 	}
+
+> INSERT  1 : 9  @  1
+
++ 	public void setDifficultyLockedForAllWorlds(boolean locked) {
++ 		for (int i = 0; i < this.worldServers.length; ++i) {
++ 			WorldServer worldserver = this.worldServers[i];
++ 			if (worldserver != null) {
++ 				worldserver.getWorldInfo().setDifficultyLocked(locked);
++ 			}
++ 		}
++ 
+
+> DELETE  18  @  18 : 38
 
 > DELETE  13  @  13 : 64
 
diff --git a/sources/main/java/net/lax1dude/eaglercraft/v1_8/EaglercraftVersion.java b/sources/main/java/net/lax1dude/eaglercraft/v1_8/EaglercraftVersion.java
index 5534ccd..1e96f51 100644
--- a/sources/main/java/net/lax1dude/eaglercraft/v1_8/EaglercraftVersion.java
+++ b/sources/main/java/net/lax1dude/eaglercraft/v1_8/EaglercraftVersion.java
@@ -10,7 +10,7 @@ public class EaglercraftVersion {
 	/// Customize these to fit your fork:
 	
 	public static final String projectForkName = "EaglercraftX";
-	public static final String projectForkVersion = "u24";
+	public static final String projectForkVersion = "u25";
 	public static final String projectForkVendor = "lax1dude";
 	
 	public static final String projectForkURL = "https://gitlab.com/lax1dude/eaglercraftx-1.8";
@@ -20,7 +20,7 @@ public class EaglercraftVersion {
 	public static final String projectOriginName = "EaglercraftX";
 	public static final String projectOriginAuthor = "lax1dude";
 	public static final String projectOriginRevision = "1.8";
-	public static final String projectOriginVersion = "u24";
+	public static final String projectOriginVersion = "u25";
 	
 	public static final String projectOriginURL = "https://gitlab.com/lax1dude/eaglercraftx-1.8"; // rest in peace
 	
@@ -31,7 +31,7 @@ public class EaglercraftVersion {
 	public static final boolean enableUpdateService = true;
 
 	public static final String updateBundlePackageName = "net.lax1dude.eaglercraft.v1_8.client";
-	public static final int updateBundlePackageVersionInt = 24;
+	public static final int updateBundlePackageVersionInt = 25;
 
 	public static final String updateLatestLocalStorageKey = "latestUpdate_" + updateBundlePackageName;
 
diff --git a/sources/main/java/net/lax1dude/eaglercraft/v1_8/sp/server/EaglerIntegratedServerWorker.java b/sources/main/java/net/lax1dude/eaglercraft/v1_8/sp/server/EaglerIntegratedServerWorker.java
index b19c20c..f695ebe 100644
--- a/sources/main/java/net/lax1dude/eaglercraft/v1_8/sp/server/EaglerIntegratedServerWorker.java
+++ b/sources/main/java/net/lax1dude/eaglercraft/v1_8/sp/server/EaglerIntegratedServerWorker.java
@@ -257,7 +257,11 @@ public class EaglerIntegratedServerWorker {
 			case IPCPacket0ASetWorldDifficulty.ID: {
 				IPCPacket0ASetWorldDifficulty pkt = (IPCPacket0ASetWorldDifficulty)ipc;
 				if(!isServerStopped()) {
-					currentProcess.setDifficultyForAllWorlds(EnumDifficulty.getDifficultyEnum(pkt.difficulty));
+					if(pkt.difficulty == (byte)-1) {
+						currentProcess.setDifficultyLockedForAllWorlds(true);
+					}else {
+						currentProcess.setDifficultyForAllWorlds(EnumDifficulty.getDifficultyEnum(pkt.difficulty));
+					}
 				}else {
 					logger.warn("Client tried to set difficulty while server was stopped");
 				}
diff --git a/sources/setup/workspace_template/build.gradle b/sources/setup/workspace_template/build.gradle
index 34d3181..4579994 100644
--- a/sources/setup/workspace_template/build.gradle
+++ b/sources/setup/workspace_template/build.gradle
@@ -26,7 +26,7 @@ teavm.js {
     obfuscated = true
     sourceMap = true
     targetFileName = "../classes.js"
-    optimization = org.teavm.gradle.api.OptimizationLevel.AGGRESSIVE
+    optimization = org.teavm.gradle.api.OptimizationLevel.BALANCED // no fps boost was observed with "AGGRESSIVE"
     outOfProcess = false
     fastGlobalAnalysis = false
     processMemory = 512