I've been looking for info about the benefits of using clam mode with MacBook Air. Do you get better performance with only the external screen activated? Sorry if this is such a basic question, but I'm a newbie and clam shell mode is new to me. Planning to get 13" MBA and external monitor and would appreciate some advice on getting best performance. Does having the MBA vertical in an arc stand help with cooling ... Better than sitting flat on a desk? Does the MBA get hotter in clam mode?