var instanceExp = Expression.Parameter(typeof(object), "instance");

            var method = typeof(string).GetMethod("GetType", new Type[0]);
            var getTypeExp = Expression.Call(instanceExp, method);

            var tmp = Expression.Lambda(getTypeExp, instanceExp).Compile();

            Stopwatch methodWatch = new Stopwatch();
            methodWatch.Start();
            for(int i = 0; i < 1000; i++)
            {
                method.Invoke(1, new object[0]);
            }
            methodWatch.Stop();
            Stopwatch expWatch = new Stopwatch();
            expWatch.Start();
            for (int i = 0; i < 1000; i++)
            {
                tmp.DynamicInvoke(1);
            }
            expWatch.Stop();
            var t1 = methodWatch.ElapsedTicks;
            var t2 = expWatch.ElapsedTicks;