Reproduced on Ubuntu 10.10, Inkscape 0.48. It was terribly slow and ate all my memory. Had to kill Inkscape to save my computer.
But apparently, revision 10464 works far better. It's still a bit slow, due to the size of the SVG file, but it now open correctly with no memory over-consumption, and zooming and spanning is relatively fast.
I'm tempted to mark the report Fix committed... Could someone else confirm the improvement?