[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

[Martin Steigerwald via KDE Bugzilla]

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

--- Comment #28 from Martin Steigerwald <Martin at Lichtvoll.de> ---
There seem to be three issues in what you observe:

1) There is folder synchronisation when you enter a folder and click mails in
there to read them. I don´t have that and for me this operation is, except for
few second initial delay to open the folder (any eventual threading work of
KMail not counted), instant or almost instant. That may be something for a
different bug report to keep that one to the performance on folder
synchronisation itself. For Maildir I did a bug report about IMHO superfluous
synchronisation (bug #334209). For any excessive folder synchronisation reading
mails, if you really see this, this would be worth a different bug. But maybe
what you see is the initial folder synchronisation on after you switched to the
folder that you see there. Does it really synchronize the folder again and
again when reading mails in it? Then I would report this as a different bug (if
not already done by someone).


2) As per the title you choose folder synchronisation itself taking a lot of
time. And well I can see this here as well. Its easily taking up half a minute
or more. And generating a lot of queries. Its not creating much load on my
MySQL, but that may be due to creating a lot of load to my IMAP server. I see
both mysqld at about 20% of one core and akonadi_imap_resource at about 30% of
one core. Now your IMAP is local, and thus will be faster to access and that I
think easily explains the higher MySQL load you see. Actually synchroniszing
that 24500 mail inbox folder took as much time as typing all of this second
point. Easily more than a minute.


3) During folder synchronisation Akonadi blocks out other operations like
deleting or viewing mails. I reported this as:

[Akonadi] [Bug 334206] New: While maildir resources synchronrizes a folder
KMail blocks on switching to a different folder

and will change the title of the bug IMAP resources as well now. I bet it may
affect *any* resources.

I suggest to keep this report about the actual folder synchronisation speed
from now on for clarity.

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