[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 #22 from Martin Steigerwald <Martin at Lichtvoll.de> ---
Gunther, I am not sure what is going on on your system, cause when I access a
76000 mails folder it takes about 8 seconds to actually see KMail showing the
first mails and starting the threading operation. Or another example: About 10
seconds to access debian-devel-changes folder with slightly more than 133000
messages, this time flat view without threading. I don´t see why this couldn´t
even be faster… but its quite a bit faster from what you report.

This all after akonadictl stop, echo 3 > /proc/sys/vm/drop_caches, akonadictl
start, so without any in memory caching on a ThinkPad T520 Sandybridge i5, 2.5
to max 3.2 GHz, machine with Dual SSD BTRFS RAID 1. I use MariaDB 10.0.26, but
I don´t think it makes much of a difference to MySQL.

mysqld load a mere 60-80% for some of this time. I did not create a query log.
How did you create it, I may create one so we can compare whether on my setup
Akonadi does something different. Then after the MySQL activity KMail was at
about 80% on one core for a few seconds.

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