http://mail.openjdk.java.net/pipermail/nashorn-dev/2014-April/002920.html

Dears

I found if the script is evaled with binding, the execution time increased
a lot.
Do you know the reason?
Check this

String script_text = "var a = 1";

       ScriptEngineManager manager = new ScriptEngineManager();
       ScriptEngine engine = manager.getEngineByName("js");
       CompiledScript script = ((Compilable) engine).compile(script_text);

       Bindings bindings = engine.createBindings();

       long dt = new Date().getTime();
       for (int i = 0; i < 100000; i++) {
           script.eval();
           //script.eval(bindings); // switch to this line and feel the
slow speed,
       }
       System.out.println(new Date().getTime() - dt);

--
Best wishes
     GAO