Label.toString performance improvement

Current version of toString/paramString in the Label is not effective.
Code:
=====
        String str = ",align=";
        switch (alignment) {
          case LEFT: str += "left"; break;
          case CENTER: str += "center"; break;
          case RIGHT: str += "right"; break;
        }
        return super.paramString() + str + ",text=" + text;
=====
generated to something like this:
        String s = ",align=";
        switch(alignment) {
          case 0: s = (new StringBuilder()).append(s).append("left").toString(); break;
          case 1: s = (new StringBuilder()).append(s).append("center").toString(); break;
          case 2: s = (new StringBuilder()).append(s).append("right").toString(); break;
        }
        return (new StringBuilder()).append(super.paramString()).append(s).append(",text=").append(text).toString();