https://bugs.kde.org/show_bug.cgi?id=515043

Jan Przybylak <[email protected]> changed:

           What    |Removed                     |Added
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                 CC|                            |[email protected]

--- Comment #1 from Jan Przybylak <[email protected]> ---
I can confirm this issue. I opened the same image in Gwenview and in Koko and
the latter was significantly faster.

I think the issue might be lack of multi-core processing. I tested this by
quickly zooming in and out while monitoring the CPU and GPU usage:  Gwenview
seems to use 100% one core, whereas Koko uses a small percentage of every core
and perhaps more of the GPU too.

I know Koko is a newer application with fewer features (otherwise I'd be using
it), but maybe the viewer component or something else related to performance
could be ported to Gwenview.

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