https://bugs.kde.org/show_bug.cgi?id=358231

            Bug ID: 358231
           Summary: desktop locks up when moving files
           Product: dolphin
           Version: 15.12.0
          Platform: openSUSE RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-n...@kde.org
          Reporter: ric...@nakts.net

this might not be a dolphin problem, as it also locks up the desktop, but i'm
not sure what would be a better component.
i've searched around for an existing bugreport, and bug #342056 seems similar -
but the symptoms and the cause seem to be somewhat different here.

when moving files and the source directory contains lots of files, the source
dolphin window becomes unresponsive for some time. whole desktop (taskbar,
systray, notifications etc) completely lock up for an even longer time.
experiencing this with jpg files specifically. happens both with previews
enabled and disabled.

this does not happen when moving one or two files. moving 7 files locks the
system up for some 4 seconds. moving 20 files locks the system up for some
13-20 seconds. larger amounts of files moved lock the system up for a much
longer time.

note that actual applications work perfectly fine, and it is possible to
alt-tab to them. the kde panel (including systray, taskbar, menu, notification
and other popups) is the only thing that locks up. the source dolphin window
also locks up, but for a shorter period of time.

this is tied to the amount of files in the source window and the amount of
files moved. moving images into the directory with many files works much
faster.

Reproducible: Always

Steps to Reproduce:
1. have a directory with a large amount of files - for example, 1500
2. select some of those files - for example, 100
3. move them to another directory (ctrl-x, ctrl-v in another dolphin window)

Actual Results:  
the source dolphin window locks up for some time. taskbar, systray, all popups
lock up for an even longer time.

Expected Results:  
files are moved instantly, like they did in kde4

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