[dolphin] [Bug 499551] Dolphin hangs when opening context menu for directory with many files or for a huge file selection

[Andrea Ippolito]

https://bugs.kde.org/show_bug.cgi?id=499551

--- Comment #12 from Andrea Ippolito <andrea.ippo at gmail.com> ---
(In reply to Andrea Ippolito from comment #10)
> Created attachment 178012 [details]
> flamegraph context menu on large file selection
> 
> This is to show the context menu on a selection of 5000 flat files (4KB
> .bin), no sub-dirs
> 
> Seems to be related to mime types again (triggered by the compress/extract
> actions)?

Disabling Ark's compress and extract context menu entries improved the
situation drastically (a few seconds before VS barely over 1 second now)(In
reply to Méven from comment #11)
> (In reply to Andrea Ippolito from comment #10)
> > Created attachment 178012 [details]
> > flamegraph context menu on large file selection
> > 
> > This is to show the context menu on a selection of 5000 flat files (4KB
> > .bin), no sub-dirs
> > 
> > Seems to be related to mime types again (triggered by the compress/extract
> > actions)?
> 
> Yes that's a different issue in ark in CompressFileItemAction and
> ExtractFileItemAction that scan all the files.
> They will probably need some similar work to limit the determineMimeType
> calls:
> https://invent.kde.org/utilities/ark/-/blob/master/app/
> compressfileitemaction.cpp?ref_type=heads
> https://invent.kde.org/utilities/ark/-/blob/master/app/extractfileitemaction.
> cpp?ref_type=heads
> 
> It exposes two issues with the API, the plugins can impact the application
> (there run in main thread) and those mimetypes have already be determined by
> dolphin when it loaded the folder, so they could share this information.

Cool, thanks! What's the best way to report this to Ark/Gwenview in your
opinion?

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