Thanks a lot for the answers, take a look of my scores:

> system.time(pairs(USJudgeRatings))
   user  system elapsed
  1.240   0.532  17.295

> X11(type="Xlib")
> system.time(pairs(USJudgeRatings))
   user  system elapsed
  0.224   0.020   0.437

For the graphics I'll propose the question to R-help mailing list.
Thanks a lot!

Enrico Guastaldi




2009/1/22 Barry Rowlingson <b.rowlingson@lancaster.ac.uk>

> 2009/1/22 Enrico Guastaldi <enrico.guastaldi@gmail.com>:
>
> > Moreover, the graphic result is very poor, if I compare the resolution of
> > two graphic windows (see attached file, Linux ont he left, and Windows on
> > the right: the latter is really much better!!!)
> >
> > What I'm doing wrong? Or, what is wrong in X configuration of our Linux
> > computers?
> > Remeber that R in MS Windows under virtual machine is 10 times faster!
>
>  Cairo?!
>
>  Your attachments have been stripped (or you forgot to attach them),
> but latest R versions use the Cairo graphics 'engine', which produces
> higher quality output at a speed cost. You can fire up a non-Cairo
> device with X11(type="Xlib").
>  The difference in speed is a factor 5 on my machine:
>
>  > X11(type="Xlib")
>  > system.time(pairs(USJudgeRatings))
>   user  system elapsed
>  0.176   0.004   0.407
>  > system.time(pairs(USJudgeRatings))
>   user  system elapsed
>  0.836   0.252   2.398
>
>  Cairo graphics can look a bit 'blurred' because of the anti-aliasing.
>
> Barry
>

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