[AUCTeX] (setq TeX-auto-save t) really necessary?

[Uwe Siart]

Hello AUCTeXers,

I run AUCTeX with

  (setq TeX-parse-self t)
  (setq-default TeX-master nil)

but without

  (setq TeX-auto-save t)

because I want to keep AUCTeX from creating ./auto directories. Since
I'm quite lucky with this I also advise new users to do so (AUCTeX
newbies are often surprised about those ./auto's).

My question is whether there is a serious loss in performance without
having (setq TeX-auto-save t). To my understanding the only consequence
is that AUCTeX doesn't remember its parsing information between sessions
but this shouldn't be so bad on nowadays machines.

-- 
Uwe