R help - Mar 2012 - R package to efficiently create polyline shape file

I need to convert dbf/csv data to an ESRI shape file consisting of 200,000
polylines in R.  I used the package "shapefiles" that can create small
shape
files.  I found it takes too much time for create 200,000 polylines.  I
checked the source codes and found R loop is used.  I guess it may be the
reason.  

I tried some other software and found the procedure just takes a few seconds
but I want to do the work in R. Is there a package using compiled codes so
that this work can be done more efficiently?   Thanks a lot for your
precious information!    

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