[Bug 243829] New: KMail2 takes all the cpu and too much time to process and group messages in an imap folder

[Stefano]

https://bugs.kde.org/show_bug.cgi?id=243829

           Summary: KMail2 takes all the cpu and too much time to process
                    and group messages in an imap folder
           Product: KMail 2
           Version: 2.0 beta1
          Platform: Archlinux Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: stavallo at unina.it


Version:           2.0 beta1 (using Devel) 
OS:                Linux

I have around 20 folders in my emai account, where the Inbox folder has ~25k
emails (occupying ~6GB) while the other folders contain less messages (100 on
average).

I did not use the migrator, as I started with a newly created user. I also
disabled nepomuk in the system settings.

After launching kmail, I tried (by using the wizard) to create an online imap
account (thus by not checking "download messages for offline use"). The
synchronization was successful and now I can see all the emails in my folders.
However, there are two annoying issues:

- processing and grouping emails is very slow and takes all my cpu. For
instance, processing and grouping threads for my inbox takes around 10 seconds,
while with kmail 4.4 (and disconnected imap account) took ~1 second.

- deleting messages in kmail does not delete emails from the imap server.
Indeed, after some time, deleted messages re-appear in my folders.


Reproducible: Always

Steps to Reproduce:
Create an online imap account and use kmail2

-- 
Configure bugmail: https://bugs.kde.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.