Hello Mark, 
I have now set "OverclockMem" and reduced resolution slightly
and it both helped somewhat. Probably it is memory bandwidth 
limit indeed.
Thanks again for an excellent explanation.
---
Best regards,
Nikolai Zhubr

> > Yet another note, in 16bpp (+dri) it appeared to increase
> > from 85 to 254/sec. Strange thing.
>
>    Yes, I would expect the 32bpp to be half the performance
> of 16bpp.  That driver also has (or at least had) and option
> of running in 24bpp.  You might try it there.  Back from when
> I ran Matrox cards on P3s, I thought I recall getting closer to
> 150/sec.  I had the SGRAM versions of the cards though.  The
> SDRAM versions might be slower.  You might also see if the
> resolution/refresh rate has anything to do with it.  If it
> does, it would imply that memory bandwidth is running out.
> Back when I worked on the driver there was an "OverclockMem"
> option that would give you more memory bandwidth.
>
>
>                       Mark.
>

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