[Konsole-devel] [Bug 155174] Significant delay when switching tabs

[Eike Hein]

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http://bugs.kde.org/show_bug.cgi?id=155174         




------- Additional Comments From hein kde org  2008-01-07 14:23 -------
I'm seeing the same slow speed as George, and I believe this is caused by the unlucky combination of Qt 4 and the proprietary nVidia drivers, which is known to cause severe slow down in various Qt drawing operations.

I've been rewriting Yakuake for KDE 4 these past two weeks (almost done) and can say the same about its opening animation, which is based on progressively adjusting the window mask to reveal a Konsole terminal display widget: While perfectly smooth in Xephyr's software implementation of XRender or with Intel drivers, it's quite a bit jerkier on my nVidia-powered main X server. Similarly, Yakuake keeps Konsole KParts in a widget stack and adjusts its custom tab bar painting in response to one of the terminals being raised, and this is just as slow as in Konsole on nVidia, while feeling instantaneous on Xephyr/Intel. 

I.e. I don't think Konsole is broken per se; it's something in nVidia's XRender acceleration infrastructure or Qt 4's painting system.

Others have noticed this as well: http://nowwhatthe.blogspot.com/2007/12/performance-and-qt-44-again.html