Re: Qt apps still slow with non-antialiased fonts (256.35)
XRender isn't slow if you have a good CPU and on Intel onboard cards is actually fast. Might you, XFCE's compositor is smooth using an old computer and that uses XRender.
The Nouveau driver is fast with XRender as well. Kwin's compositing using XRender is pretty good, last time I tried it in KDE 4.4.