diff --git a/core/src/mindustry/ai/BlockIndexer.java b/core/src/mindustry/ai/BlockIndexer.java
index 11278ddac6..f5ff55e1e6 100644
--- a/core/src/mindustry/ai/BlockIndexer.java
+++ b/core/src/mindustry/ai/BlockIndexer.java
@@ -302,7 +302,7 @@ public class BlockIndexer{
             returnBool = false;
 
             allBuildings(wx, wy, range, b -> {
-                if(pred.get(b)){
+                if(pred.get(b) && !b.block.privileged){
                     returnBool = true;
                     cons.get(b);
                 }
@@ -314,7 +314,7 @@ public class BlockIndexer{
             var buildings = team.data().buildingTree;
             if(buildings == null) return false;
             buildings.intersect(wx - range, wy - range, range*2f, range*2f, b -> {
-                if(b.within(wx, wy, range + b.hitSize() / 2f) && pred.get(b)){
+                if(b.within(wx, wy, range + b.hitSize() / 2f) && pred.get(b) && !b.block.privileged){
                     breturnArray.add(b);
                 }
             });
@@ -340,7 +340,7 @@ public class BlockIndexer{
         var buildings = team.data().buildingTree;
         if(buildings == null) return false;
         buildings.intersect(rect, b -> {
-            if(pred.get(b)){
+            if(pred.get(b) && !b.block.privileged){
                 breturnArray.add(b);
             }
         });
diff --git a/core/src/mindustry/content/SerpuloTechTree.java b/core/src/mindustry/content/SerpuloTechTree.java
index a596abd3ad..879ea6ad55 100644
--- a/core/src/mindustry/content/SerpuloTechTree.java
+++ b/core/src/mindustry/content/SerpuloTechTree.java
@@ -120,7 +120,7 @@ public class SerpuloTechTree{
                         });
                     });
 
-                    node(pyratiteMixer, () -> {
+                    node(pyratiteMixer, Seq.with(new SectorComplete(crateredBattleground)), () -> {
                         node(blastMixer, Seq.with(new SectorComplete(facility32m)), () -> {
 
                         });
diff --git a/core/src/mindustry/game/Schematics.java b/core/src/mindustry/game/Schematics.java
index fb299ba4d2..f7e2193588 100644
--- a/core/src/mindustry/game/Schematics.java
+++ b/core/src/mindustry/game/Schematics.java
@@ -49,6 +49,7 @@ public class Schematics implements Loadable{
 
     private static final byte[] header = {'m', 's', 'c', 'h'};
     private static final byte version = 1;
+    private static final boolean limitSchematicSize = true;
 
     private static final int padding = 2;
     private static final int maxPreviewsMobile = 32;
@@ -553,7 +554,7 @@ public class Schematics implements Loadable{
         try(DataInputStream stream = new DataInputStream(new InflaterInputStream(input))){
             short width = stream.readShort(), height = stream.readShort();
 
-            if(width > 128 || height > 128) throw new IOException("Invalid schematic: Too large (max possible size is 128x128)");
+            if(limitSchematicSize && (width > 128 || height > 128)) throw new IOException("Invalid schematic: Too large (max possible size is 128x128)");
 
             StringMap map = new StringMap();
             int tags = stream.readUnsignedByte();
@@ -594,7 +595,7 @@ public class Schematics implements Loadable{
 
             int total = stream.readInt();
 
-            if(total > 128 * 128) throw new IOException("Invalid schematic: Too many blocks.");
+            if(limitSchematicSize && total > 128 * 128) throw new IOException("Invalid schematic: Too many blocks.");
 
             Reads read = new Reads(stream);
 
diff --git a/core/src/mindustry/input/InputHandler.java b/core/src/mindustry/input/InputHandler.java
index 4c93e68b23..9486b8625c 100644
--- a/core/src/mindustry/input/InputHandler.java
+++ b/core/src/mindustry/input/InputHandler.java
@@ -2353,24 +2353,36 @@ public abstract class InputHandler implements InputProcessor, GestureListener{
         return validPlace(x, y, type, rotation, ignore, false);
     }
 
+    //static to avoid capture allocation
+    private static BuildPlan vpIgnore;
+    private static Block vpBlock;
+    private static int vpX, vpY;
+
+    private static final Boolf<BuildPlan> vpPredicate = plan ->
+        plan != vpIgnore
+        && !plan.breaking
+        && !(vpBlock.canReplace(plan.block) && plan.x == vpX && plan.y == vpY);
+
     public boolean validPlace(int x, int y, Block type, int rotation, @Nullable BuildPlan ignore, boolean ignoreUnits){
+        if(!(ignoreUnits ? Build.validPlaceIgnoreUnits(type, player.team(), x, y, rotation, true, true) : Build.validPlace(type, player.team(), x, y, rotation))){
+            return false;
+        }
+
         if(player.isBuilder() && player.unit().plans.size > 0){
             Tmp.r1.setCentered(x * tilesize + type.offset, y * tilesize + type.offset, type.size * tilesize);
             plansOut.clear();
             playerPlanTree.intersect(Tmp.r1, plansOut);
 
-            for(int i = 0; i < plansOut.size; i++){
-                var plan = plansOut.items[i];
-                if(plan != ignore
-                && !plan.breaking
-                && plan.block.bounds(plan.x, plan.y, Tmp.r1).overlaps(type.bounds(x, y, Tmp.r2))
-                && !(type.canReplace(plan.block) && Tmp.r1.equals(Tmp.r2))){
-                    return false;
-                }
-            }
+            float s = type.size * tilesize;
+            vpIgnore = ignore;
+            vpBlock = type;
+            vpX = x;
+            vpY = y;
+
+            return playerPlanTree.find(x * tilesize + type.offset - s / 2f, y * tilesize + type.offset - s / 2f, s, s, vpPredicate) == null;
         }
 
-        return ignoreUnits ? Build.validPlaceIgnoreUnits(type, player.team(), x, y, rotation, true, true) : Build.validPlace(type, player.team(), x, y, rotation);
+        return true;
     }
 
     public boolean validBreak(int x, int y){
diff --git a/core/src/mindustry/net/ArcNetProvider.java b/core/src/mindustry/net/ArcNetProvider.java
index 3110558167..d695ba9fa4 100644
--- a/core/src/mindustry/net/ArcNetProvider.java
+++ b/core/src/mindustry/net/ArcNetProvider.java
@@ -435,6 +435,7 @@ public class ArcNetProvider implements NetProvider{
             }else{
                 //read length int, followed by compressed lz4 data
                 Packet packet = Net.newPacket(id);
+                if(!packet.allow(net.server())) throw new RuntimeException("Invalid packet type for endpoint: " + packet.getClass());
                 var buffer = decompressBuffer.get();
                 int length = byteBuffer.getShort() & 0xffff;
                 byte compression = byteBuffer.get();
diff --git a/core/src/mindustry/net/Packets.java b/core/src/mindustry/net/Packets.java
index e766e59434..af4bc95b12 100644
--- a/core/src/mindustry/net/Packets.java
+++ b/core/src/mindustry/net/Packets.java
@@ -77,6 +77,11 @@ public class Packets{
         public int total;
         public byte type;
 
+        @Override
+        public boolean allow(boolean server){
+            return !server;
+        }
+
         @Override
         public void write(Writes buffer){
             buffer.i(id);
@@ -96,6 +101,11 @@ public class Packets{
         public int id;
         public byte[] data;
 
+        @Override
+        public boolean allow(boolean server){
+            return !server;
+        }
+
         @Override
         public void write(Writes buffer){
             buffer.i(id);
diff --git a/core/src/mindustry/net/Streamable.java b/core/src/mindustry/net/Streamable.java
index c150fc26f3..f1a1c8e7e7 100644
--- a/core/src/mindustry/net/Streamable.java
+++ b/core/src/mindustry/net/Streamable.java
@@ -12,6 +12,11 @@ public class Streamable extends Packet{
         return priorityHigh;
     }
 
+    @Override
+    public boolean allow(boolean server){
+        return !server;
+    }
+
     public static class StreamBuilder{
         public final int id;
         public final byte type;