[Bug 307058] New: KMail reacts sluggish but keeps telling my by system notification that it is not broken

[Marcel Wiesweg]

https://bugs.kde.org/show_bug.cgi?id=307058

            Bug ID: 307058
          Severity: normal
           Version: 4.9.1
          Priority: NOR
          Assignee: kdepim-bugs at kde.org
           Summary: KMail reacts sluggish but keeps telling my by  system
                    notification that it is not broken
    Classification: Unclassified
                OS: Linux
          Reporter: marcel.wiesweg at gmx.de
          Hardware: openSUSE RPMs
            Status: NEW
         Component: message list
           Product: kmail2

Fresh conversion from kmail1, large local mail dir. Folders have 20k-50k
messages. Reading new mail in a folder, going to the next unread message.
Reaction is sluggish, 
1) unread mails stay marked as unread in the message list for severeal seconds
to minutes, unread counter is correctly decreased in the folder tree view on
the left.
2) every now and then showing the mail body fails ( the mail body view shows a
"busy message" that the folder's contents are currently being downloaded). Next
attempt at showing a mail may succeed
3) kmail/akonadi/mysql eating CPU and memory in the background
4) Often during that time, a system notification pops up: (translated from
German translation back to English): "The resource 'KMail folder' is not
inoperative. It is now online". Telling me it is not broken via system
notification??

I know these are different symptoms but they occur together in one situation so
my be caused by the same problem, so a single report by now.

Reproducible: Always

Steps to Reproduce:
1.Take a larger local mail collection
2.Get new mails
3.Open folder for reading, use "+" to navigate to next unread mail
Actual Results:  
as above

Expected Results:  
As fast as KMail1!

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