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From: Eric Abrahamsen <eric@ericabrahamsen.net>
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Subject: Re: is nnmaildir very slow?
Date: Fri, 24 May 2019 14:26:04 -0700
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Eric S Fraga <e.fraga@ucl.ac.uk> writes:

> On Saturday, 18 May 2019 at 06:53, George Clemmer wrote:
>> Eric S Fraga <e.fraga@ucl.ac.uk> writes:
>>
>>> On Thursday, 16 May 2019 at 14:29, Eric Abrahamsen wrote:
>>>> But after that is it quick? I can't imagine it's regenerating the NOV
>>>> files at every startup...
>>>
>>> It is quick after the initial startup.  I don't know if it is slow at
>>> every startup.
>>
>> In my experience, as long as I kept Emacs running the performance was
>> great and ~ to Mu4E. The hit was only associated with an Emacs restart.
>
> I've done more experimenting.  The problem is definitely at startup and
> *only* after I have synchronized systems.  The maildir scan is a "deep"
> one, it seems, based on whether the directory has been modified.  An
> indication of modification is taken purely from the time attribute.  So,
> my synchronization makes gnus think the contents have changed.
>
> I don't know how to get around this...

I can't think of any way to get around it, except maybe by saving a
"last modified" time along with the server information in the files
you're syncing...