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i would like to be able to monitor konqueror activity more closely. After several hours running, it starts swapping to disk, heavily loading the whole system. I would like to locate which tab is faulty, so as to be able to close it, rather than closing the web browser. Would it be sensible providing a specific konqueror log file?

I would say this is more a debugging feature that's not that relevant to ordinary users. In your case I would identify the problematic page by starting separate konquerors. Maybe it's even related to some faulty plugins and has nothing to do with konqueror itself. But if it looks like its a konqueror problem, write a bug report to bugs.kde.org.