[Konversation-devel] [Bug 144233] New: removing lines from the top of a full scrollback buffer is slow

[David L Emerson]

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http://bugs.kde.org/show_bug.cgi?id=144233         
           Summary: removing lines from the top of a full scrollback buffer
                    is slow
           Product: konversation
           Version: 1.0.1
          Platform: Debian stable
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: konversation-devel kde org
        ReportedBy: demerson3x angelbase com


Version:           1.0.1 (using KDE KDE 3.5.5)
Installed from:    Debian stable Packages
OS:                Linux

If I set the scrollback limit to 2000 lines, then at 1900, everything is quick and snappy.  However, once it reaches 2000, it is significantly slower.
If I reduce the limit to 500 lines, then again, when the buffer is full, things are very slow.

In fact, 1900/2000 lines is significantly quicker than 500/500.

I'm using a PII 333 MHz, so it is easy to see this slowness ;)

Proposal: rather than deleting lines one by one, delete them in chunks.  e.g. only delete when the buffer reaches 10% over the limit.