Hi Joseph, http://www.carto.net/papers/svg/postgis_geturl/ has a listing of possible optimizations at the bottom of the tutorial. http://www.svgopen.org/2002/papers/isakowski_neumann__svg_for_interactive_topographic_maps/index.html has a section on "code optimization". As you mentioned yourself, performance is not only about filesize. It also depends on the implementation and the underlying XML parser. To get more info about that you would have to contact the authors of the implementation, f.e. you could ask at the batik list or contact the Adobe people. In my own experience with map data, it is key to reduce the number of elements in the DOM. Maintaining the DOM is memory and computing expensive and keeping the number of elements low, helps. For example if you represent an island with lots of closed, disjunct polygons it is better to represent this island by one single path-element with several "M"ovetos than creating several <path/> elements and grouping them. I once came across this while processing Navteq/Teleatlas data that was extremely segmented. I first de-segmentized this data and got much better performance. Another thing is to reduce accuracy. There f.e. is no use in representing data with 8 decimal places if the base unit is a meter and accuracy is about 10 meters. Also, reducing the number of vertices helps. Many GIS or graphics software have simplification and smoothing functionality. In cartography, f.e. one good spline curve can replace a dozen or more single vertices and it even looks better when zooming in. I also made the experience that using a lot of <symbol /> and <use /> elements slowed down the Adobe viewer but worked well in other viewers. This must be an implementation issue and probably depends on how the DOM is maintained and the XML parsed. Hope this helped a bit to get started. I would be very much interested in your results. Please publish them if you make progress. Good luck with your work, Andreas
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