[OS X TeX] TeXshop - preview jumping after typeset

[Warren Nagourney]

Hello,

I am using TeXshop 2.18 under OS X 10.4.11 on a Powerbook at 1.5 GHz  
with 1 Gb of ram. I have been using TeXshop since it came out 7+  
years ago and have recently been writing a book.  I love the program  
and finally started trying to use some of its nicer features, like  
synchronization (which I loved on TeXtures).

My problem is the frequent, seemingly random,  jumps of the preview  
window immediately after typesetting (using pdfLatex).  It will jump  
up to several pages from the place being viewed, forcing me to move  
back. It does this whether I am in page mode or continuously  
scrolling. The behavior takes a significant chunk out of my time and  
focus on the material and is frankly very annoying. This has always  
been a problem with TeXshop and I am finally motivated to find a fix,  
it it exists. Is there any fix?

One other question. I realize that I am not running the latest and  
fastest computer (and I have no plans to upgrade), but typesetting  
can be very slow. For a number of reasons, I typeset the entire book  
every time (about 200 pages at present - lots of equations and pdf  
figures); I realize that this is not necessarily the best strategy.   
I have a linux system (a Playstation 3, of all things) and it is much  
faster typesetting using pdftex in Kile (it should be a bit slower,  
from processor comparisons). Can one put the fonts into a cache or  
ram disk to speed things up?

Thanks very much.

Warren Nagourney