[Akonadi] [Bug 338571] Performance Regression: Folder synchronisation in Akonadi 16.08 (actually in any release, starting with KDE 4.14) very slow, compared to kMail from KDE 4.13.x

[Tore Anderson]

https://bugs.kde.org/show_bug.cgi?id=338571

--- Comment #49 from Tore Anderson <tore at fud.no> ---
(In reply to Martin Steigerwald from comment #47)
> Tore, Gunther or someone else who commented here: Could you please check
> whether you still have those performance issues you reported there with
> KDEPIM/Akonadi 20.04?

I can try. I obviously haven't been using KMail in the last few years, but now
I installed a Fedora 32 KDE VM to perform, upgraded it to Rawhide to get
KDEPIM/Akonadi 20.04, rebooted it and deleted all files (including hidden) in
my home directory from a console login (just to make sure what I am about to
report was not a holdover from the previous Akonadi version in Fedora 32) and
logged back in.

The result - just from logging in - is that ~/.local/share/akonadi/db_data
contains 158 MiB of stuff.

To be clear: I have *not* started KMail, *not* edited any Akonadi settings, or
anything like that. The *only* thing I have done is to log in from a completely
empty user account, start Konsole, run 'du' to check disk usage.

Yet Akonadi has managed to store 158 MiB of what has to be completely pointless
stuff. That is beyond comprehension, and certainly does not give me any hope
that this bug is anywhere close to being fixed, quite the opposite. Akonadi's
disk and resource usage seems to still be beyond insane.

That said, I will test towards an IMAP account later and update this bug with
my findings.

> If so, it might be good to report it in a new bug since – with my
> contribution unfortunately, this bug report has so many comments that it may
> be difficult to make sense out of it for a developer.

What's the point? The reason why this bug has many comments is that it has
languished here or almost six years with no developer taking any interest in
actually fixing it. Why assume a new bug report will be treated any differently

KMail is unusable with IMAP accounts with more than a few thousand messages,
and it's been like this for years. I can only surmise that this is a use case
the developers care about (which is fair enough, don't get me wrong, I get what
I pay for here).

Tore

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