Jerky/laggy scrolling

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http://askubuntu.com – I run 11.10 with unity, NVidia Quadro NVS 140M with driver 280.13. In a fresh session, graphics performance is ok. However, after a while or with some open applications, 2D-scrolling performance degrades heavily. Scrolling through a 800-line text file takes half a minute, with frequent freezes in the process, rendering any text editing mostly unusable for me. Interestingly, I can run two full screen HD videos with both the videos and text scrolling in Geany seemingly unaffected. On the other hand, as soon as I open any another application that involves 2D-scrolling (browser, terminal, text (HowTos)