Scrolling in chromium and image panning in geeqie suddenly slow

I have a laptop with a Sandy Bridge processor (Intel Core i7 2670QM with Intel HD3000 integrated graphics). Before today, scrolling long web pages in chromium by clicking on the scrollbar, holding and moving the mouse was instantaneous, and panning (moving) large photos in GQview was instantaneous as well, albeit with tearing present (which I don't mind in those particular cases, I only care about responsiveness).
Today it suddenly changed. Fast scrolling in chromium lags significantly (it's elastic, if you know what I mean), same for image panning in GQview, though with no tearing present.
I haven't the faintest idea as to what could possibly have changed. I then installed Geeqie to see if it would change anything, and it did: panning was again instantaneous, with tearing. Then a bit later, with no modification on the system whatsoever, it started lagging again. So I rebooted, started X and launched Geeqie immediately to make sure that no other software could influence X or anything, but it was still laggy.
I don't know how to reproduce the change either way. Something is obviously escaping me, but I have no clue what. My system is up to date (pacman -Syu). I'm running Openbox with compositing disabled. Any ideas?
Last edited by apaige (2012-01-04 14:15:58)

Some additional details: firefox 9.0.1 (downloaded from Mozilla's FTP, not Arch Linux's package) scrolls instantaneously, and image panning in The GIMP is instantaneous as well.
GTKPerf results for 1000 iterations:
GtkPerf 0.40 - Starting testing: Wed Jan 4 16:24:50 2012
GtkEntry - time: 0.28
GtkComboBox - time: 4.02
GtkComboBoxEntry - time: 1.79
GtkSpinButton - time: 0.32
GtkProgressBar - time: 0.18
GtkToggleButton - time: 0.33
GtkCheckButton - time: 0.31
GtkRadioButton - time: 0.77
GtkTextView - Add text - time: 50.30
GtkTextView - Scroll - time: 1.90
GtkDrawingArea - Lines - time: 6.58
GtkDrawingArea - Circles - time: 7.87
GtkDrawingArea - Text - time: 4.51
GtkDrawingArea - Pixbufs - time: 0.84
Total time: 80.00
Last edited by apaige (2012-01-04 15:28:13)

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Scrolling in chromium and image panning in geeqie suddenly slow

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