Kmail is slow to move large amount of mails to wastebin then empty wastebin - pop account

[Philip Wyett]

Steps to Reproduce:

1. Archive a folder. Not necessary for problem to occur.
2. Select all mails in a folder 10000+ a good example amount.
3. Click on 'Move to Wastebin'

Actual Results:

Action is slow. Average is one mail processed per second.

High CPU usage. Forces system fan on constantly while action is taking place.

Expected Results:

Expect them to be marked and moved to wastebin much faster.

No other mail application has this issue.

This is an horrific issue for those who get a lot of email. Archiving email with this issue and cleaning out folders takes hours - productivity loss. I now canot allow folders to have more than a certain amount of emails in because of this issue.

This system has no imap accounts on it.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: kmail 4:4.8.5-0ubuntu0.1
ProcVersionSignature: Ubuntu 3.5.0-23.35~precise1-generic 3.5.7.2
Uname: Linux 3.5.0-23-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: amd64
Date: Wed Feb 6 15:19:18 2013
InstallationMedia: Kubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120820.1)
MarkForUpload: True
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: kdepim
UpgradeStatus: No upgrade log present (probably fresh install)

[Philip Wyett (philip-wyett-deactivatedaccount)]

Kmail is slow to move large amount of mails to wastebin then empty wastebin - pop account

Kubuntu 12.04.1

KDE 4.8.5

Kmail 4.8.5

Hardware: Toshiba L850-112 laptop. i3 @ 2.3GHz, 6Gb RAM, SATA 2 HDD

Reproducible: Always

Steps to Reproduce:
1. Archive a folder. Not necessary for problem to occur.
2. Select all mails in a folder 10000+ a good example amount.
3. Click on 'Move to Wastebin'
Actual Results:
Action is slow. Average is one mail processed per second.

High CPU usage. Forces system fan on constantly while action is taking place.

Expected Results:
Expect them to be marked and moved to wastebin much faster.

No other mail application has this issue.

This is an horrific issue for those who get a lot of email. Archiving email with this issue and cleaning out folders takes hours - productivity loss. I now canot allow folders to have more than a certain amount of emails in because of this issue.

This system has no imap accounts on it.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[helios (martin-lichtvoll)]

Hi Philip, thank for your report and sorry for taking so long to answer it.

It is about a version of KMail which uses Nepomuk and is unmaintained. Thus
closing. If you still see performance issues please open new reports. But
please follow the following guide lines to avoid unnecessary work for the
developers:

- Ideally test with KDEPIM and Akonadi 15.08. It contains some performance
improvements like the binary protocol.

- Otherwise at least use KDEPIM 4.14.10 and newest Akonadi 1.13 you can get as
it already contains some performance improvements.

- If you can wait, please retest with KDEPIM and Akonadi 15.12 once they become
available for you. Akonadi 15.12 will contain *massive* performance
improvements implemented by Dan due to new database indexes, optimized queries
and leveled file_db directory. All of these are in master already, so if you
dare use kdesrc-build to compile KF5, kdepim and kdepim-runtime. I am using
this currently and it basically moves the bottleneck to KMail (displaying message list
of huge folder). It is a *huge* improvement. And also Volker and Dan work to improve
message list display speed as well.

Thank you and greetings from KDE Randa Meetings,