Re: RMAIL slows

[Richard Stallman]

       You might try killing the Rmail buffer and visiting the file again,
       in the old session.  Does this make it get fast again?

    If it does, it is only a very little.  I am not sure whether it does
    or whether the little difference is my imagination.

    However, after killing that instance of Emacs and starting a new
    instance, rmail sped up dramatically.

Well, there goes my guess.  We can only await more information from
you.

If you do xbacktrace while Rmail is doing whatever takes up the time,
you should get some useful information for us.  You need to do this
enough times so that you see a pattern.