Fixed #6090

core/src/mindustry/input/InputHandler.java

@@ -1186,6 +1186,7 @@ public abstract class InputHandler implements InputProcessor, GestureListener{
     }
 
     public boolean validPlace(int x, int y, Block type, int rotation, BuildPlan ignore){
+        //TODO with many requests, this is O(n * m), very laggy
         for(BuildPlan req : player.unit().plans()){
             if(req != ignore
                     && !req.breaking