[Konsole-devel] [Bug 83890] Scrolling extremely slow when the windows contains broken lines

[Robert Knight]

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http://bugs.kde.org/show_bug.cgi?id=83890         
robertknight gmail com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED



------- Additional Comments From robertknight gmail com  2006-08-07 17:28 -------
Fixed in Konsole for KDE 4.  Changed the rendering process to cut down the excessive number of QPainter::drawText() calls.

Under KDE 4, Konsole's behaviour is fairly similiar to Xterm.  That is, I get the following results (using the same number of iterations as you):

Width  |  Time 

1      |  87s
1000   |  34s
10000  |  34s

I'm not absolutely sure why Konsole under KDE 4 is noticeably slower when width = 1, but I do know that the way that Konsole scrolls the screen up when adding a new line is very inefficient, which may well have something to do with it.