[Xastir] Xastir compile options

[Dick C. Reichenbach]

Tom Russo wrote:

>I also recommend enabling rtree spatial indexing if you plan to use shapefile 
>maps and do a bunch of zooming and panning operations --- this option,
>while still marked "experimental" is very stable and can speed up map redraws
>when using shapefiles that cover much more area than you intend to view at any
>given time.  rtree builds a spatial index that makes choosing what parts of
>the shapefile to display much faster, but its benefits only show up if you're
>doing lots of map redraws while zoomed in to a small area.
>
>  
>

How does rtree indexing affect redrawing of weather alerts?  Weather 
alert redrawing is one of the major drags on my machine.  I've been 
using rtree indexing for a very long time now, but I've never seen a 
difference, as far as weather alerts go. 

Dick R. - KC8OBZ