performance fixes

src/com/jpexs/decompiler/flash/gui/abc/ABCPanel.java

@@ -804,7 +804,7 @@ public class ABCPanel extends JPanel implements ItemListener, ActionListener, Se
 
                 try {
                     String oldSp = null;
-                    List<ScriptPack> packs = abc.script_info.get(oldIndex).getPacks(abc, oldIndex);
+                    List<ScriptPack> packs = abc.script_info.get(oldIndex).getPacks(abc, oldIndex, null);
                     if (!packs.isEmpty()) {
                         oldSp = packs.get(0).getClassPath().toString();
                     }

src/com/jpexs/decompiler/flash/gui/abc/ClassesListTreeModel.java

@@ -81,7 +81,8 @@ public class ClassesListTreeModel extends AS3ClassTreeItem implements TreeModel
                 }
             }
 
-            AS3Package pkg = ensurePackage(item.getClassPath().packageStr);
+            String packageStr = item.getClassPath().packageStr;
+            AS3Package pkg = ensurePackage(packageStr);
             pkg.addScriptPack(item);
         }
     }