[konsole] [Bug 443885] New: Konsole is very slow to output text to screen

[Waqar Ahmed]

https://bugs.kde.org/show_bug.cgi?id=443885

            Bug ID: 443885
           Summary: Konsole is very slow to output text to screen
           Product: konsole
           Version: master
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: konsole-devel at kde.org
          Reporter: waqar.17a at gmail.com
  Target Milestone: ---

SUMMARY

Konsole is super slow to output a lot of text to screen. This output can be
from any app for e.g., cat or debug output etc.


STEPS TO REPRODUCE
1. Open Konsole and type "cat some_big_file"
2. Notice that konsole takes a lot of time

Also, I must note here that this isn't just some non-practical problem. "cat
xyz" is just an example. I face this issue while working on an app which spews
a lot of text to the screen when starting up and due to this slowness it is
very slow to launch and test the app every time. Doing some profiling shows
that 90% of the time is being spent in just (de)allocations.


KDE Frameworks Version: master
Qt Version: 5.15.2

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