[Akonadi] [Bug 338571] Performance Regression: Folder synchronisation in Akonadi 15.12 (actually in any release, starting with 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 #18 from Gunter Ohrner <kdebugs at CustomCDROM.de> ---
I'm now on KDE Neon with KDE Frameworks 5.25 and Applications 16.08 (kMail
5.3.0), see below for a detailed package list.

It did not get any better, just opening my "sent" folder just took 87 seconds
(!) during which kMail synced the folder twice. I guess noone want's to have
forced breaks of one-and-a-half minute while working with his email client...

As written above, kMail as well as the IMAP server are running locally, the
system disk is an SSD and MySQL just get's hammered by Akonadi during that
time.

Whatever was changed between KDE 4.13 and 4.14 in this respect concerning
kMail, Akonadi, IMAP and their cooperation just was no good idea and no proper
fix for whatever it was intended to fix...

$ COLUMNS=200 dpkg -l | egrep 'akonadi|kmail'
ii  akonadi-backend-mysql                        4:16.08.0+p16.04+git2016082
all                         MySQL storage backend for Akonadi
ii  akonadi-contacts-data                        4:16.08.0+p16.04+git2016082
all                         akonadi-contact data files
ii  akonadi-mime-data                            4:16.08.0+p16.04+git2016082
all                         akonadi-mime - data files
ii  akonadi-server                               4:16.08.0+p16.04+git2016082
amd64                       Akonadi PIM storage service
ii  akonadiconsole                               4:16.08.0+p16.04+git2016082
amd64                       management and debugging console for akonadi
ii  kmail                                        4:16.08.0+p16.04+git2016082
amd64                       full featured graphical email client
ii  libakonadi-kde4                              4:4.14.10-1ubuntu2         
amd64                       library for using the Akonadi PIM data server
ii  libakonadi-kmime4                            4:4.14.10-1ubuntu2         
amd64                       Akonadi MIME handling library
ii  libakonadiprotocolinternals1                 1.13.0-8ubuntu2            
amd64                       libraries for the Akonadi PIM storage service
ii  libkf5akonadiagentbase5:amd64                4:16.08.0+p16.04+git2016082
amd64                       Akonadi agent base library
ii  libkf5akonadicalendar5:amd64                 4:16.08.0+p16.04+git2016082
amd64                       library providing calendar helpers for Akonadi
items
ii  libkf5akonadicontact5:amd64                  4:16.08.0+p16.04+git2016082
amd64                       Akonadi contacts access library
ii  libkf5akonadicore5:amd64                     4:16.08.0+p16.04+git2016082
amd64                       Akonadi core library
ii  libkf5akonadimime5:amd64                     4:16.08.0+p16.04+git2016082
amd64                       Akonadi MIME handling library
ii  libkf5akonadinotes5:amd64                    4:16.08.0+p16.04+git2016082
amd64                       Akonadi notes access library
ii  libkf5akonadiprivate5:amd64                  4:16.08.0+p16.04+git2016082
amd64                       libraries for the Akonadi PIM storage service
ii  libkf5akonadisearch-bin                      4:16.08.0+p16.04+git2016082
amd64                       Akonadi search library - runtime binaries
ii  libkf5akonadisearch-data                     4:16.08.0+p16.04+git2016082
all                         Akonadi search library - data files
ii  libkf5akonadisearch-plugins:amd64            4:16.08.0+p16.04+git2016082
amd64                       Akonadi search library - runtime plugins
ii  libkf5akonadisearchcore5:amd64               4:16.08.0+p16.04+git2016082
amd64                       Akonadi search core library
ii  libkf5akonadisearchdebug5:amd64              4:16.08.0+p16.04+git2016082
amd64                       Akonadi search debug library
ii  libkf5akonadisearchpim5:amd64                4:16.08.0+p16.04+git2016082
amd64                       Akonadi search library
ii  libkf5akonadisearchxapian5:amd64             4:16.08.0+p16.04+git2016082
amd64                       Akonadi search xapian library
ii  libkf5akonadiwidgets5:amd64                  4:16.08.0+p16.04+git2016082
amd64                       Akonadi widgets library


In fact, these versions of kMail and Akonadi feel much more "snappy" while
working with mails - just the most serious performance problem was not solved
and did not improve, unfortunately.

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