Firefox scrolling -- how to get it smooth

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https://bbs.archlinux.org – How I can get firefox to scroll webpages smoothly and effortlesly? Now it's chopping while using much CPU resources. It works as expected in Opera, Chromium and Konqueror. I'm using KDE, Nvidia GeForce 7300GT with nvidia proprietary driver. I have tried no composition, XRender, OpenGL native and raster. I have also set nvidia-settings -a InitialPixmapPlacement=2 and forced layers acceleration in about:config. mkkot https://bbs.archlinux.org/profile.php?id=32136 2013-05-09T23:09:03Z (HowTos)