Quote Originally Posted by kokoko3k View Post
Install and use qtcurve-gtk theme and open firefox on a page with a lot of buttons/checkboxes, then scroll it.
like this:

Then install cairo-nvidiablob from aur and scroll it again.
For me, vanilla cairo is jerky with the blob, smooth with everything else, i just tried again.

What's qtcurve got to do with what you're describing? Also note that Cairo OpenGL support is marked as experimental, therefore not expected to work flawlessly to begin with.