[Konsole-devel] [konsole] [Bug 362696] New: Poor rendering performance

[via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=362696

            Bug ID: 362696
           Summary: Poor rendering performance
           Product: konsole
           Version: 15.12.3
          Platform: Gentoo Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: konsole-devel at kde.org
          Reporter: razrfalcon at gmail.com

Konsole widget update/repaint are extremely poor. 
Fast scrolling or selecting large part of text eats one CPU core completely.
Even minimazing-maximazing causes freeze for a second.

All other applications works fine.

I tried to profile it with valgrind and it looks like this:
http://itmages.ru/image/view/4231589/588a6a04
Full log: https://dl.dropboxusercontent.com/u/16019144/konsole-callgrind.7z
(668KiB)

Also tested on 16.07.70 from git. Same performance.

Reproducible: Always

Steps to Reproduce:
1. Open Konsole
2. ls -lR
3. Try to select all text



I got nVidia with proprietary driver with __GL_YIELD="USLEEP" to prevent
tearing.

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