[ubuntu] After a while, LibreOffice Writer gets SLOW?

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http://ubuntuforums.org – I have a new and unusual problem which I believe may have started when I upgraded to Ubuntu 11.10, but which may have occurred later. When I first boot up my computer and start LibreOffice Writer, everything seems fine. After about two hours of switching back and forth between various applications, I start to notice slow scrolling. Shortly after that, I have a noticeable lag in response to typing, and pop-up menus take up to a second to appear. Every other application that I have open continues to operate normally. The largest file that I am editing in LibreOffice Writer is a bit (Hardware)