[korganizer] [Bug 501965] New: Performance regression: Each action in Korganizer are extremely slow making it unusable

[Alexandre Bonneau]

https://bugs.kde.org/show_bug.cgi?id=501965

            Bug ID: 501965
           Summary: Performance regression: Each action in Korganizer are
                    extremely slow making it unusable
    Classification: Applications
           Product: korganizer
           Version: 6.3.2
          Platform: Debian testing
                OS: Linux
            Status: REPORTED
          Severity: grave
          Priority: NOR
         Component: agendaview (weekview)
          Assignee: kdepim-bugs at kde.org
          Reporter: alexandre.bonneau at linuxfr.eu
  Target Milestone: ---

SUMMARY
Each action in Korganizer are extremely slow since the last Debian testing
update of kdepim6 in January 2025

STEPS TO REPRODUCE
1. Install Korganizer 6.3.2 in Debian Testing (even as a new user)
2. Configure Korganizer to use your Nextcloud calendar, which has 10k+ elements
(tasks and events)

OBSERVED RESULT
- When ever you edit an event/task, move one at a different time slot, or just
try to use the mouse wheel on the calendar to change week, it takes several
seconds for Korganizer to show the new weekview or the result of your action
- Before it was instant; this hinders its usability _greatly_, to a point it's
unusable in a work environment
- Moreover, now when you edit a single event, the whole week is updated, which
is very impactful since it moves around all the overdue tasks to the top bar.
Before it was better; if you wanted to update the week-view, you had to mouse
wheel up then down on the mini-calendar. Your 'missed' scheduled tasks would
not move on their own until you decided so.

EXPECTED RESULT
- Instant browsing of the calendar events
- Do not update the week-view when editing a single event/tasks in the view
(and by update I mean moving the overdue tasks to the top bar of the current
day)
I suspect the fact that Korganizer now updates (in a very badly way
performance-wise) every single event/tasks on the current week-view (and
perhaps even more), and since I usually have 100+ event/tasks per week, this
takes too much time and is very, VERY noticeable.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Debian Testing
KDE Plasma Version: plasma-desktop 4:6.3.2-2+b2
KDE Frameworks Version: plasma-framework 5.115.0-7
Qt Version: 6.8.2
korganizer 4:24.12.2-1
kdepim 4:24.12.2+5.158
kdepimruntime 4:24.12.2-1
akonadiserver 4:24.12.2-1

ADDITIONAL INFORMATION
Linked Debian bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1092963

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