[OS X TeX] Is it possible to speed up rendering in TexShop?

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Greetings all,

As I mentioned in one of my earlier posts, I am writing my doctoral 
thesis in LaTeX.  Currently it is only about 40 pages, but will 
eventually run to about 200.  A problem that I am running into is that 
every time I want to render a preview, XeTeX (the engine I am using) has 
to regenerate *everything*. 

I'm wondering if there isn't some way to speed things up, so that it 
doesn't take half a minute (or more) every time to produce the PDF.  I 
have an older Mac (G3 900mhz) so optimizations to speed things up will 
come in very handy.

Thanks in advance for any assistance,
Erik Norvelle

Universidad de Navarra
Pamplona, Spain


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