[R] Can I disable Cairo?

[Mario Valle]

On Linux 2.13 by default links cairo, so png() uses it for rendering.
One of my users has performance problem, so ask if it possible to 
temporary disable cairo during png() rendering so it reverts to grGraphics.
My workaround for now is to configure R without cairo, but this affects 
all users that are forced to load and use CairoDevice if they wants 
better quality.
I want to avoid this, is it possible?
Thanks!
                             mario

-- 
Ing. Mario Valle
Data Analysis and Visualization Group            | http://www.cscs.ch/~mvalle
Swiss National Supercomputing Centre (CSCS)      | Tel:  +41 (91) 610.82.60
v. Cantonale Galleria 2, 6928 Manno, Switzerland | Fax:  +41 (91) 610.82.82