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Teemu Likonen <tlikonen@iki.fi> writes:
>>> C-x C-f /sudo::/etc/fstab RET
>>
>> Nice one. Only the first time I use it, it take some time. When I do
>> it a second time, it is quit fast.
>
> With Emacs 22 it's slow first time. Fortunately with Emacs 23 /sudo: and
> /su: are always fast.

That explains it. The system I tried it on was still running 22.3.1. I
tried it on another system with 23 and there was no delay.