The unused variable 'useFastBufs' has been re-added to ensure backward compatibility with projects that use it to do nothing

jme3-core/src/plugins/java/com/jme3/export/binary/BinaryExporter.java

@@ -137,6 +137,7 @@ public class BinaryExporter implements JmeExporter {
     private final ArrayList<Savable> contentKeys = new ArrayList<>();
 
     public static boolean debug = false;
+    public static boolean useFastBufs = true;
 
     /**
      * Constructs a new {@code BinaryExporter}.