Speeding up xorg's composite extension

After enabling the composite extension in xorg with

Section "Extensions"  
Option "Composite" "Enable"  
EndSection

and enabling the Translucence/Shadow Features in kde 3.4 or by using the xcompmgr tool I noticed a dramatically slowdown in my X.

I searched around and found the following options to speed it up to normal speed again.

For NVIDIA cards, add the following to the Device section in your X config file:

Option        "RenderAccel" "true"

For ATI cards:

Option        "backingstore" "true"

and for both cards:

Option        "AllowGLXWithComposite" "true"

That should give you both pro's: translucence and shadow as well as speed.
Note: the composite extension is unstable (at least on my box).

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