[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

[Gunter Ohrner via KDE Bugzilla]

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

--- Comment #20 from Gunter Ohrner <kdebugs at CustomCDROM.de> ---
Currently slightly more than 41000 mails. It was somewhat less two years ago
with kMail from KDE 4.13, but not significantly, and the performance dropped
all of a sudden with the update.

Thunderbird is quite snappy with a folder that size, but I like kMail more -
although the extremely bad performance is definitely getting on my nerves.

I tried increasing the innodb buffer size, but this did not result in any
significant improvement.

My impression is that there's at least one separate query issued for each mail,
maybe more. This would also match the observations stated above by another
user. Probably a lot less queries were issued in kMail 4.13, which also was
already based on Akonadi. (KDE 4.7 was the first release that included the
Akonadi-based kMail 2.)

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