diff --git a/build.gradle b/build.gradle
index 9c75d7a3c9..a0e3c900b1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -13,11 +13,12 @@ buildscript{
         google()
         maven{ url "https://oss.sonatype.org/content/repositories/snapshots/" }
         maven{ url 'https://jitpack.io' }
+        maven{ url "http://artifactory.nimblygames.com/artifactory/ng-public/" } //packr
     }
 
     dependencies{
         classpath 'com.mobidevelop.robovm:robovm-gradle-plugin:2.3.11'
-        classpath "com.github.anuken:packr:-SNAPSHOT"
+        classpath "com.badlogicgames.packr:packr-all:4.0.0"
         classpath "com.github.Anuken.Arc:packer:$arcHash"
         classpath "com.github.Anuken.Arc:arc-core:$arcHash"
     }
diff --git a/core/src/mindustry/content/UnitTypes.java b/core/src/mindustry/content/UnitTypes.java
index b44eec609b..934546ec78 100644
--- a/core/src/mindustry/content/UnitTypes.java
+++ b/core/src/mindustry/content/UnitTypes.java
@@ -1759,7 +1759,7 @@ public class UnitTypes implements ContentList{
 
             armor = 3f;
 
-            buildSpeed = 2f;
+            buildSpeed = 1.5f;
 
             weapons.add(new RepairBeamWeapon("repair-beam-weapon-center"){{
                 x = 0f;
@@ -1833,7 +1833,7 @@ public class UnitTypes implements ContentList{
             trailY = -4f;
             trailScl = 1.9f;
 
-            buildSpeed = 2.5f;
+            buildSpeed = 2f;
 
             weapons.add(new Weapon("plasma-mount-weapon"){{
 
@@ -1906,7 +1906,7 @@ public class UnitTypes implements ContentList{
             trailY = -9f;
             trailScl = 2f;
 
-            buildSpeed = 3f;
+            buildSpeed = 2f;
 
             weapons.add(new RepairBeamWeapon("repair-beam-weapon-center"){{
                 x = 11f;
@@ -2044,7 +2044,7 @@ public class UnitTypes implements ContentList{
             trailY = -17f;
             trailScl = 3.2f;
 
-            buildSpeed = 3.5f;
+            buildSpeed = 3f;
 
             abilities.add(new EnergyFieldAbility(35f, 65f, 180f){{
                 repair = 35f;
@@ -2085,7 +2085,7 @@ public class UnitTypes implements ContentList{
             trailY = -32f;
             trailScl = 3.5f;
 
-            buildSpeed = 3.8f;
+            buildSpeed = 3.5f;
 
             for(float mountY : new float[]{-117/4f, 50/4f}){
                 for(float sign : Mathf.signs){
diff --git a/desktop/build.gradle b/desktop/build.gradle
index 948b5413f9..872b8a5891 100644
--- a/desktop/build.gradle
+++ b/desktop/build.gradle
@@ -72,7 +72,12 @@ task steamtest(dependsOn: dist){
     }
 }
 
-//TODO replace with jpackage templates
+//required templates:
+//- Windows64
+//required JDKs:
+//- Windows32
+//- Linux64
+//- Mac
 PackrConfig.Platform.values().each{ platform ->
     task "packr${platform.toString()}"{
         dependsOn dist
@@ -102,6 +107,7 @@ PackrConfig.Platform.values().each{ platform ->
             }else{
                 def config = new PackrConfig()
                 config.with{
+                    //TODO consider useZgcIfSupportedOs = true
                     config.executable = appName
                     config.platform = platform
                     verbose = true
@@ -112,8 +118,7 @@ PackrConfig.Platform.values().each{ platform ->
                     classpath = ["$rootDir/desktop/build/packr/desktop.jar".toString()]
                     removePlatformLibs = ["$rootDir/desktop/build/packr/desktop.jar".toString()]
 
-                    vmArgs = []
-                    minimizeJre = "$rootDir/desktop/packr_minimize.json".toString()
+                    vmArgs = ["XX:+ShowCodeDetailsInExceptionMessages"]
                     jdk = JDK_DIR + "jdk-${platform.toString().toLowerCase()}.zip"
 
                     if(platform == PackrConfig.Platform.MacOS){
diff --git a/desktop/packr_minimize.json b/desktop/packr_minimize.json
deleted file mode 100644
index d18eb478a8..0000000000
--- a/desktop/packr_minimize.json
+++ /dev/null
@@ -1,116 +0,0 @@
-{
-  "reduce": [
-    {
-      "archive": "jre/lib/rt.jar",
-      "paths": [
-        "javax/transaction",
-        "javax/tools",
-        "javax/swing",
-        "javax/sql",
-        "javax/smartcardio",
-        "javax/rmi",
-        "javax/print",
-        "javax/naming",
-        "javax/management",
-        "javax/lang",
-        "javax/jws",
-        "javax/swing",
-        "javax/imageio",
-        "javax/annotation",
-        "javax/activity",
-        "javax/activation",
-        "javax/accessibility",
-        "com/sun/corba",
-        "com/sun/jmx",
-        "com/sun/org",
-        "com/sun/imageio",
-        "com/sun/jndi",
-        "com/sun/xml",
-        "com/sun/script",
-        "sun/awt",
-        "sun/java2d",
-        "sun/font",
-        "sun/rmi",
-        "sun/swing",
-        "com/sun/media",
-        "sun/print",
-        "sun/awt",
-        "sun/instrument",
-        "sun/security/tools",
-        "sun/security/smartcardio",
-        "sun/audio",
-        "javax/xml",
-        "javax/sound",
-        "javax/script",
-        "java/beans",
-        "java/applet",
-        "java/rmi",
-        "com/sun/naming",
-        "java/awt",
-        "com/sun/org/apache/xpath",
-        "com/sun/rowset",
-        "com/sun/script",
-        "sun/applet",
-        "sun/corba",
-        "sun/management"
-      ]
-    },
-    {
-      "archive": "jre/lib/charsets.jar",
-      "paths": [
-      ]
-    },
-    {
-      "archive": "jre/lib/jsse.jar",
-      "paths": [
-      ]
-    },
-    {
-      "archive": "jre/lib/resources.jar",
-      "paths": [
-      ]
-    }
-  ],
-  "remove": [
-    {
-      "platform": "*",
-      "paths": [
-        "jre/lib/rhino.jar"
-      ]
-    },
-    {
-      "platform": "linux",
-      "paths": [
-        "jre/lib/amd64/libawt.so",
-        "jre/lib/amd64/libawt_xawt.so",
-        "jre/lib/amd64/libjawt.so",
-        "jre/lib/amd64/libhprof.so",
-        "jre/lib/amd64/libdt_socket.so",
-        "jre/lib/amd64/libsplashscreen.so",
-        "jre/lib/amd64/libunpack.so",
-        "jre/lib/amd64/libnpt.so",
-        "jre/lib/amd64/libmlib_image.so",
-        "jre/lib/amd64/libinstrument.so",
-        "jre/lib/amd64/libjava_crw_demo.so",
-        "jre/lib/amd64/libfreetype.so",
-        "jre/lib/amd64/libmanagement.so",
-        "jre/lib/amd64/libsctp.so",
-        "jre/lib/amd64/libjpeg.so",
-        "jre/lib/amd64/libfreetype.so.6",
-        "jre/lib/amd64/libjsoundalsa.so",
-        "jre/lib/amd64/libjsound.so",
-        "jre/lib/amd64/libattach.so",
-        "jre/lib/amd64/libawt_headless.so",
-        "jre/lib/amd64/libfontmanager.so"
-      ]
-    },
-    {
-      "platform": "windows",
-      "paths": [
-        "jre/bin/*.exe",
-        "jre/bin/client",
-        "jre/bin/awt.dll"
-      ]
-    }
-  ]
-}