Re: FX5200 in linux low performance
My suggestion would be to run your 'nvidia-settings' (Nvidia Panel) utility, and check that in the OpenGL Settings section, that the 'Sync to VBlank' is not checked.
As I replaced my GF4 MX440 with a GF FX5700 (Here at the Office) and I ran the glxgears, only to find that it showed only 85-90fps?!. Where my GF4 MX440 showed over 700fps (Which is normal for this card). So I changed the VBlank setting to off, and now the fps's are up around the 2900+ mark. (I know that glxgears is not a benchmarking utility, but it does give you indications if the card is running the way it should or not.)