[R] Display time of PDF plots

[Rich Shepard]

   This may be an inappropriate forum for this question. If so, please point
me in a better direction.

   A current project includes scatter plots with thousands of points. Saved
as PDF files they display slowly using a pdf viewer or when included in the
PDF output of a LaTeX document.

   Is there a process by which these plots can be 'thinned' so they show the
same overall patterns but with fewer points so they display more quickly?

   Rasterizing them to .jpg files using 'convert' allows them to load
immediately, but the bit-mapped resolution is, of course, much lower than
the vector PDF format.

Rich