[okular] [Bug 421469] New: Slow search

[Frank Mehnert]

https://bugs.kde.org/show_bug.cgi?id=421469

            Bug ID: 421469
           Summary: Slow search
           Product: okular
           Version: 20.04.0
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: frank.mehnert at gmail.com
  Target Milestone: ---

SUMMARY
Searching in the Contents is very slow. This is a regression: 17.12.2-2.2
(Debian/Buster) is reasonable fast while version 20.04.0-1  (Debian/Sid) is
much slower. 

STEPS TO REPRODUCE
1. Download https://static.docs.arm.com/ddi0487/fb/DDI0487F_b_armv8_arm.pdf
2. Open the file and go to the 'Contents' search bar.
3. Enter 'esr'

OBSERVED RESULT
It takes more than 20 seconds until the few search results are presented.
During that time the application is more or less not responsible.

EXPECTED RESULT
With the old version from Buster the same search takes less than 3 seconds.
It's possible to put search strings there character by character and the
incremental search function is reasonable fast. That's not possible with the
current 20.04.0 version.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Debian/Sid, 5.17.5, Linux 5.6.0
(available in About System)
KDE Plasma Version: 5.17.5
KDE Frameworks Version: 5.62.0
Qt Version: 5.12.5

ADDITIONAL INFORMATION
My host is reasonable fast (Skylake i7-7700 HQ, T470p, 24G RAM, SSD)

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