Plot optimization [Was: Re: [R] Plotting Speed: R vs Octave]

  It seems to make more sense to put a tiny bit of effort into
thinning the points at your end rather than building code into
R's postscript driver to deal with this case. 

I will have to study your code, but it seems to me, that such
problem can occur quite often, so that optimization-out of this
... well, I believe, bug ... could help a lot.

Matej