Comment 8 for bug 456038

I don't think the duplicate status is correct. For example, this talks of slowness in scrolling - while the other bug is specifically about DNS lookups. I have this issue too, and the problem is with Firefox painting the screen (at least for me). For a few seconds Firefox goes into a "I will not update my screen" mode, where all my mouse clicks and key presses are registered and processed correctly, but the screen will not be updated. Then for a few seconds it's fine, and then a few seconds of frozen screen again. I'm on Kubuntu 9.10, and this happens both with Kwin compositing enabled and disabled. I have an Intel GM965/GL960 graphics card.