[okular] [Bug 451059] Okular freezes for up to 10 seconds when loading a document or switching windows

[Amaury Pouly]

https://bugs.kde.org/show_bug.cgi?id=451059

--- Comment #5 from Amaury Pouly <amaury.pouly at gmail.com> ---
(In reply to Albert Astals Cid from comment #4)
> I just tried with 32 okular instances open and the canOpenDocs elapsed time
> for all the instances when opening a new one never took more than 75ms
> (tried 20 times or so), which makes sense, canOpenDocs should be very fast
> since it do much.
> 
> When you say "open a new document", how exactly are you opening it?
> 
> Any peculiarity of your system that you think may cause this? Remote NFS
> file system? weird libc? weird dbus rules?

I usually either open it using Dolphin or using Zotero, but it can also happen
just when switching between virtual desktops and not opening anything (less
common though). Everything is local (not NFS), nothing particularly custom, no
special dbus rules.

When it happens, switching between virtual desktops is a often a trigger. For
example:
1) open file A.pdf => fast
2) switch to other virtual desktop
3) open file A.pdf => slow
4) close it, open A.pdf => fast
5) switch to other virtual desktop
6) open A.pdf => slow

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