Xorg Composite Extension Slow with nVidia Twinview
 

I have a Dell Inspiron 8200 with GeForce4Go 64MB graphics. Running 1400x1050 resolution on Xorg 6.8.1. In this configuration I get excellent performance with the X Composite Extension Enabled and running:

xcompmgr -f -c

However, when I enable TwinView in my xorg.conf file the performance suddenly becomes terrible (almost unusable). With TwinView enabled, my second monitor is only running 1024x768, so I don't see why there should be such a huge performance hit.

I am using the standard AGPGART with AGP running in 4X mode. (I am using a standard Fedora Core 3 kernel so it has AGPGART statically compiled in and I can't use the nvAGP module).

I also have the following options set:

Option "TwinView"
Option "TwinViewOrientation" "leftOf"
Option "SecondMonitorHorizSync" "31.5 - 90"
Option "SecondMonitorVertRefresh" "50.0-75.0"
Option "MetaModes" "1024x768,1400x1050"
Option "NvAgp" "2"
Option "DPMS"
Option "RenderAccel" "true"
Option "AllowGLXWithComposite" "true"

Also the only extension is:

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

Does anyone else have the same problem? I use my laptop with the second screen most of the time so I'd appreciate any suggestions anyone might have.

Cheers.

Hello,

you can also try to add the following option to improve a bit:
But I've also tried to use composite extension and that's true that with this option enabled performance decreased a lot :mad: maybe because of a lack of hardware support :confused: