[okular] [Bug 409852] New: Okular takes an extreme amount of time to load a djvu file over samba

[John van Spaandonk]

https://bugs.kde.org/show_bug.cgi?id=409852

            Bug ID: 409852
           Summary: Okular takes an extreme amount of time to load a djvu
                    file over samba
           Product: okular
           Version: 1.3.3
          Platform: Kubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: DjVu backend
          Assignee: okular-devel at kde.org
          Reporter: john at van-spaandonk.nl
  Target Milestone: ---

SUMMARY
Loading a book (djvu) from my NAS in okular can take up to 30 seconds.
The problems seems less big with PDF books.
Book size 2 to 3 megabytes, so not particularly big.
Copying the same book from the NAS by dragging it from Dolphin to a local
folder (SSD) takes about .2 seconds. Opening in Okular from there takes about
.2  seconds (difficult to time, but very fast). So the underlying
infrastructure seems to work fine, therefore I think the problem is related to
Okular.

I conclude that when I open a document in Okular over samba I pay a performance
penalty of a factor of 50 - 100. This makes it unusable to browse books there.

My setup I used to reproduce this problem.
Kubuntu18.04, desktop computer connected to NAS via 1Gbit ethernet cable.
Note that this is a fast network setup, so now slow links / wireless etc.
The NAS drive is listed in the fstab with this line, and thus mounted a system
startup:
/192.168.1.2/NAME        /media/MOUNT_POINT  cifs  
user=XXXX,password=XXXX,rw,user,nosuid,uid=1000,gid=100,_netdev,vers=1.0    0  
    0

STEPS TO REPRODUCE
1. Browse to the document folder on the NAS
2. Double click a document to open it in Okular
3. 

OBSERVED RESULT
The whole Okular interface blocks for 30-40 seconds (also does not redraw so it
messes up the desktop view). The rest of the desktop is usable as normal.

EXPECTED RESULT
View the book in Okular in less than .5 seconds

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Kubuntu 18.04 LTS
(available in About System)
KDE Plasma Version: 5.12.7
KDE Frameworks Version: 5.44.0
Qt Version: 5.9.5

ADDITIONAL INFORMATION
I used journalctl to look in the syslog, but all it says is 
ResourceScoreUpdated: "4625dd2c-8a74-4017-8be6-6dc7c47d29ab"
"okularapplication_djvu" .....

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